Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a72d57655e969c2…

MALICIOUS

PDF

96.0 KB Created: 2021-06-29 01:23:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c74de21dafb9f66d167f348191933c69 SHA-1: c48576f263df9abf5bc32e1a348f4e64e47373d5 SHA-256: 1a72d57655e969c2667a514add45e9a0717301f71ba7d6c1ea3f8c702ceac838
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous external URIs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic to obscure the true destination by hosting links on seemingly legitimate but compromised domains. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9446

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://smidgel.ru/uplcv?utm_term=rockabye+cover+mp3+download PDF link annotation
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/ig746v7ljebilces5ee77dgqva/fawamopixowirigabe.pdfIn PDF document text
    • http://kistours.hu/userfiles/file/dobimarevasut.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/15239537523.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5f9816b09---mebamalivaramu.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/43915900945.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/0c771252206444c2305fc6d7e8133ddd/97010196510.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607f7fc780ac7---93222069497.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/153c607ca0d910b0bdb13d02b392a037/sogenaverapilevas.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/wexakibufuwode.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a1ff0b6fc---tironupixuruluzoxoruviwu.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a97c43d5468---8975847621.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/36aa8790687fc593eebc5295c6f07ddf/13695370821.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/8l0pksjcl0505qjjrc0ntr25p0/kinagetigogakede.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee4edda613---salogo.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0db24bc51---jeketoxaj.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862183eb784---28734282909.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af81c41f04---pusemubizit.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f6a82ab39---kuputoba.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160844e431314b---nidawiri.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608690a440014---fexilozazorevadewumeg.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/160a06a2b535c984478499fb3d578cfb/daxuvinuwovetumoru.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/km38isp6clau9amnr3n3fs46u0/raxiperumojuwesuta.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb807d04f19---kodisirujosukomu.pdfIn PDF document text
    • https://ivaco.it/file/vegovagesorib.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/33762c4b7e22670cbc783ba3c17bd339/polerobotevukabesidisenem.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/lopetozifasepazabuxo.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/hcl8ggua6v191llhoipkkrusnh/13693632670.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/jurusolewagufipa.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED42 1660 bytes
SHA-256: 73a5e5ff0b686a6d452c8072f0b03751f0bcf310267ad02e6ca62e3ffc1433b8
font_01_sfnt_off0000f52b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52B 17856 bytes
SHA-256: 187f86b685c822c2d4119bd8b8083c24d17875e810a1326ba34d03801ec50e59
font_02_sfnt_off00011021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11021 11032 bytes
SHA-256: 51b4968f4cff620005aed46796af16b831f4203ec431340c908401a668a7e44a
font_03_sfnt_off000129a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A9 18192 bytes
SHA-256: 1f13047cc96af9794ee634f8b51c0a5512fa863cb15c8afabef8fe3ea4101e7b
font_04_sfnt_off0001594d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1594D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1