Malicious PDF — malware analysis report

Static analysis result for SHA-256 2170940608483310…

MALICIOUS

PDF

92.4 KB Created: 2021-08-17 10:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5899d9b2953ce912d726430c09087c9d SHA-1: 1ae571b6d11af62e7f49c35e4e08352f02ad6271 SHA-256: 217094060848331078abdd75647eb74416bce1cdd8c6f5c4e6a1a4f92547819a
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the finding that the document is a link farm on potentially untrustworthy hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://01host.ru/userfiles/files/40266249367.pdf In PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/368c86a5bfdeb5307e69f065e956f334/46661551393.pdfIn PDF document text
    • http://suseefinance.com/userfiles/file/zijorofidevi.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe4fdc2b2ff---72094096146.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ec510d9997b---feragivujosoxu.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/88438098857.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/59149798791.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eecccccb5b---67126955109.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/c336b66467228a57732680f6f39285ac/buwobovabo.pdfIn PDF document text
    • http://mosjob.ru/images/file/bejizivalinegu.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/zivobufekopusazolawapuwut.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/72263111337.pdfIn PDF document text
    • http://unsersohn.ch/images/file/24656540281.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d148dd6e18---mudewe.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/qes8t9jg67rac6n5mdp3s8lh5i/kuxoboni.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/kiwisedimexum.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e2eb865ff58---vuretafotelusotef.pdfIn PDF document text
    • http://nothingelsematters.net/pharma/images/files/99678804646.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/96d72d571d01b5d6349407ff215a057e/givikilunosenereg.pdfIn PDF document text
    • http://loaamtran.com/files/usersfiles/files/85289336007.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/e5df2017c531791239f51c2d003efb17/26181035571.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/mifadivekagafod.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/80cb05c0d4f53003ba35112129df2ac4/gagefoluwefigopop.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/27780733528.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=cubic+function+graph+worksheetPDF link annotation
    • 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_off000100a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A6 18580 bytes
SHA-256: 9a9595529602437ed90f999050da7063b6227dec63ff4316598484b8074c6d97
font_01_sfnt_off0001321c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1321C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A33 11164 bytes
SHA-256: beac2115b816538ea7ff1843689156e6d983d52c8ceeb0d036295b7f6b2a972c