Malicious PDF — malware analysis report

Static analysis result for SHA-256 39b3cf546d9c61f7…

MALICIOUS

PDF

106.7 KB Created: 2021-08-08 15:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: eba4bfd07380c3f4c61a773f58b07efd SHA-1: 29bdeb2a5b9243c3871b2b76e395c4c5ae1cb28d SHA-256: 39b3cf546d9c61f74952ee1ce517e2b1569004ef2be23822dd08aae035a39c14
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and other disposable hosting, likely to redirect users to phishing sites or download further malware. The presence of embedded JavaScript, though not fully analyzed here, further supports the potential for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://philabc.ru/uplcv?utm_term=gta+4+xbox+360+graphics+mod PDF link annotation
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c4311e72e35---vikewatedaloduvujag.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160976f1126d2f---46439752637.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/96716618692.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160941e73f3dc5---28709336624.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/d79faa5d2ae3f3cc560e7968eda4961e/15113486460.pdfIn PDF document text
    • http://www.kingsmen-cmti.com/upload/files/dakigumunetoliv.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/jasvpo7cjaoslrol9flquhceh2/75978976947.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/notokezaguzaradir.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/xiluwelaxiwegexinopogufe.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/6a6774fa43be76f131f0b5df4bb46f21/38909272876.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/82967ad93f4a9be6334d1ed9d0439539/pitajejitilugen.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/30708068244.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e121e4ab719---nevimitur.pdfIn PDF document text
    • https://mackbeks.com/files/file/ridezuse.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/waboketaxuribug.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/6h2a0ofs3ob57rk5in5oe6ab9t/gurudofaxesatekor.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/razapemifurudopapimesew.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b2f178acb---19118682012.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/a840236af5bf7460ffa83a29271a297e/tomaxuregigoxekomiwulu.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608155da9ee15---zakul.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9279b11d66---28953205767.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802bfff182a---junonemi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b574e3769e9---norinunusaxasoda.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/10795675715.pdfIn PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/wenodagisemeruzunexezolab.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11812 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13029 11500 bytes
SHA-256: cb73dde5cfb2b1cf09a25bbd743ac61d57bab03db9bbb027f8d58321efa79a8b
font_02_sfnt_off00014b07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B07 16076 bytes
SHA-256: 0491ab1f9781984131449868ed95f15036bddabad70a51597ae233fa8bdf08d0
font_03_sfnt_off0001602a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1602A 22968 bytes
SHA-256: 43b54e1c2bd7eb6681b8553f497d80004996b2e4d4a398887cc467549626eac9