Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c3ad918cf50866d…

MALICIOUS

PDF

85.6 KB Created: 2021-08-10 12:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5ca449eb220a40f2705be4bf1b12302c SHA-1: b169e5d47b9271942113d30ed3921ac20138e587 SHA-256: 6c3ad918cf50866d81ba51477db89d6791c2c0e74b0046ee72a89dfba34a6f39
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, with numerous links pointing to potentially compromised websites or disposable hosting. The presence of multiple external URIs and link farm indicators suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://campfirewtx.org/userfiles/file/nuripe.pdf In PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a748ff20b3f---tupamakunakimavoperami.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/xuvufipemaxubikuro.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/ruboputuwipamebuxazuxur.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/40352014938.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57b1da164d---51183582784.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud//files/7090873084.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9264514317---xofewanuwel.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079448c0fbbe---42819844726.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/90178231045.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608bcafa073a6---62298957522.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/kejiselidamufilunarimemez.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/wozivuzozotanut.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/18ab229ea8dd76595aa99a7cf6ff57be/99929680494.pdfIn PDF document text
    • http://allasclub.com/campannas/file/rewapemoxo.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/4620f73bbf7e9b918b7608978402e438/61792269910.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/tixuxizopafoxosave.pdfIn PDF document text
    • http://ozari-ua.com/files/file/72507893038.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/c22c03a0b79efe407ce15fdb91ed81a7/50534965849.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a78c84b50d---2473879631.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160743299a9b85---putulo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=tratamiento+para+tiroiditis+de+hashimotoPDF 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_off0000e8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EB 18008 bytes
SHA-256: 341c47c799bf18a1ab91b79580a5580b065248c2c1a1d473cb82551107d750c6
font_02_sfnt_off00012ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC6 10572 bytes
SHA-256: e962fb855963bfe26fe826e23e59a49693f0595965d5ff9d2b91e1c9af47fae9

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