Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5bdfadf94dc3186…

MALICIOUS

PDF

62.3 KB Created: 2021-05-10 02:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 4da5329745f3b2f138d580af222fc94d SHA-1: c97c05aa957043355096d786c8f2e4d228cc3fe8 SHA-256: a5bdfadf94dc3186d181ebb7c99632ba1c1fbdca03a8da6c9ea88f72c79a9961
154 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure and URL analysis are sufficient to infer a phishing or exploit delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8124

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://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6e17c2590---kijisozevapivex.pdf In PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607568de58676---revewivaxidimuzo.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-4-30/20210430093821720363.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/bb484ece598e8415fccaf914330d8caa/35268559062.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/f107303008bab6f23e6305372d1d4575/45169950551.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/054f67350bf437bd2d9b5b5bf2e5f3aa/dogusuz.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/c5a1994dd5c40bad49e5efd0e2083a77/21718425008.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085363459430---puravugizonubimavutozobuf.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/25339648814.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/83583e18f68134da1b1b9fe7530bfadf/93401309251.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/533a431256e30fbb1421af6117c70299/basuwoxelozejonoxe.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/98709917802.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/7afcb69defef65bb560a1f8010b1fc33/21324785734.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2930bfc0f---xivesatutirudinolige.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/2b9112328a8e9941625ba6e1a291cc57/lisexozimupozezafixa.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/FevRqgeaUVY/uplcv?utm_term=ged+mathematical+reasoning+pdfPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35D 5600 bytes
SHA-256: ddef9c1b0767f572a33bf5fd6bfa09f03cf17a56994751823b94ef225a88d810

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