Malicious PDF — malware analysis report

Static analysis result for SHA-256 04922982fef9bb56…

MALICIOUS

PDF

71.5 KB Created: 2021-05-08 21:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 0d42dca38e48bd2efd0a102f79cc059a SHA-1: 9739e721871c469135ac623ce12957a28e9b2667 SHA-256: 04922982fef9bb56d2ea2e5addbc88b1c02244ea79ee0fb4468818dbbb1ad86a
154 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and appears to be junk data, but the presence of link farms and compromised CMS uploads points to a malicious link distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9777

Heuristics 5

  • 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
  • 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://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af2f1e3a9c---zibozomefomelugogaw.pdf In PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/9c59ee9fc22eea9c5a95086113e06454/kujezavaxib.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/4f9efd5a92574a6ed1c81a672f3ce2c9/40778389289.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/qm3iugnsopnvto8kif3al5p9ee/39255559718.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b0cdb852f---46690203824.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbdcf88a80---59290436282.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606c95af93e4e---zitonumulebane.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/zaworelifewelimufobo.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7735990c6---buguvirebubow.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/56204730735.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/8eb7ejfrtr253bs8iu8rbikp4d/40041491084.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/gowurotudarutiv.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1ed7ba383---19202018313.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/e06173447b93301eea781978fe9165a6/65127556366.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/6eju14sabgkc6b2j4bp4b7cjen/wafogisokuxusolo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=workbook+question+answers+of+the+blue+beadPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000effd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFD 5428 bytes
SHA-256: 1dfa2e06cf7f9d3a3a25d12dd32e37b3c70d720c592f2cd6d5eab9d7641b37a3
font_01_sfnt_off00010285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10285 9992 bytes
SHA-256: b15f663e888839660c8f0e7b56365aa061aee73b174c83956a2c7b9684da49fc

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