Malicious PDF — malware analysis report

Static analysis result for SHA-256 35e5e74b300087c8…

MALICIOUS

PDF

79.4 KB Created: 2021-07-01 17:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5f33d02db7d72e9f0f88ce59c49a8c6a SHA-1: 8bd2adbe716304b8c404f06bdf6915464885bc9b SHA-256: 35e5e74b300087c800f62b3f2613d2744972d743c88da47280954ba66b7b1526
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or engage in SEO spam. The PDF structure itself does not contain executable scripts, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/ni2mjcop8b4n6l3q40733rkkf3/32339725495.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/86134512831.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b0e66eacf---vawuzajagazuxomenavo.pdf
    • http://akinmedical.com/uploads/file/48290427868.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/2fdc564e80619d58d587f0a1d53917be/xirojobimanedotezofi.pdf
    • http://namuvaldymas.lt/userfiles/file/reluzufejewapowujikibovof.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/225f80ace1ecf1b8920d669d10e43d80/63402013889.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/f9c2d57ceb02775687334d70dc28b7a7/vomidaf.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c7b2cf4aa---tawesobimawaniregitajeki.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/41381262c9f02b8f86416b736943c3a9/45005558380.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9627361da---bobugafawilufi.pdf
    • https://kitapkapla.com/upload/ckfinder/files/zowabopalat.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160710dc576622---zisilumutew.pdf
    • http://ketoanaca.com/uploads/image/files/65761912384.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/7ddad4a6dae25370c8bffbd076b8d1af/92031242100.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c172c77bcf---dufexapikowekati.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c666c5a91f0---24241158776.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/835555bc3bb3e8ba99f36090c7d7b273/bopasewekubavepevimonidob.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/sipadobevemijizur.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/7faf70f97b27570f165c57154b1124c8/jexitaxujif.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989584997c4---gamilimelofenawaruse.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfdac9c28c---nagerutotukikimo.pdf
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/91835971786.pdf
    • https://centrorevisionimonregalese.it/file/bazoxewekibom.pdf
    • https://chemasan.lu/userfiles/files/robapa.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160d377be1818b---derogikanipake.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=outpatient+department+in+hospital+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d48c.bin
484220303c5c9673ed65ad380821cae62edd6b4c45851583fa8992827478d0b3
pdf-font-stream PDF embedded font (sfnt) at offset 0xD48C 10888 bytes
font_01_sfnt_off0000ed8c.bin
c31493f2a4ab515edfadeb8aaf462a3ba56c9f8feb54b2d96a6dbdd3c225147e
pdf-font-stream PDF embedded font (sfnt) at offset 0xED8C 16468 bytes
font_02_sfnt_off00011835.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11835 16792 bytes