Malicious PDF — malware analysis report

Static analysis result for SHA-256 660ea8f8379bbecf…

MALICIOUS

PDF

85.0 KB Created: 2021-08-16 17:17:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c26cedcdb3b6f5f226a76d5beaa31f84 SHA-1: 8d479dfdca8100e04a89e43baeafd3a4a0501d61 SHA-256: 660ea8f8379bbecfd404e24d7af98f3ad949ec284769a79f2380797da52005d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs and links to compromised WordPress upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The file's structure and content point towards a malicious document designed to lure users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=unit+6+similar+triangles+homework+2+similar+figures+worksheet+answers PDF link annotation
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efc4c64b4e---11313508450.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/razugomogawivebuwad.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070adf8c4b15---merobu.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/mogevetofutibikikid.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/82314693494.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/nusanukowobofu.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/b39d8340f783c2b43f0dd2e02f7e29af/bepaxamuvibugotanazabowi.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/61292780890.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/vafitejadupewovuraxexena.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/vatoretujebagemibetu.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/68296390639.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/a12e4ac5137c1de96bea14912f972f61/20211172034.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/sasidewubexi.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a14c31ab59---87812994044.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/bedalasuxisawot.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/f4818be331ab8de7f9be72f9f42dab01/dubukajibave.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/79318702177.pdfIn PDF document text
    • http://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/62077493519.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/8041c2be771eb3370710e6146c5a384e/toxex.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/tameku.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/puxadarejokufavodegovalos.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/10994027497.pdfIn PDF document text
    • http://hibertek.com/image/files/20210620_174632.pdfIn PDF document text
    • http://dahchen.tw/userfiles/files/xuzijavojo.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/xudaniri.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/watogagafofedanaxej.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE559 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6B 17524 bytes
SHA-256: e10a8fc23580b35dabb77c9b20f39b62b741a28db7b25b2f4ee24041c90d31a8
font_02_sfnt_off00012aff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFF 11232 bytes
SHA-256: 38741ba8a22f466ed7c6bb469b0d4e666b3fe72b2b2da8cbff6b0daf6bc656ba