Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f8da68f7cfcdec2…

MALICIOUS

PDF

71.2 KB Created: 2021-05-06 22:36:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fae5265fca6b56ffa0183c35eb3f31bf SHA-1: 52fc084dda53d8320adb4c1f966bf1eba1005395 SHA-256: 3f8da68f7cfcdec2af83f1363fa01f12eab516a7a57d69d71aa3ba9470fef4d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm pointing to compromised CMS upload directories. The embedded URLs suggest an attempt to direct users to potentially malicious content hosted on these compromised sites, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9679

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/1j2uf82i3g0r9ktghlkn265kak/14306805519.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ef9a415ad---77032915937.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b87ef9578b---xibut.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/65oipdd8ik5iikev75qvogqal4/kesafevofezo.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/mbgq09p9gt5qkuv97672ee9mns/44484910522.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a1e09d61b---1104064742.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082997547a11---malomabopejizamakukexajog.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160943515b186e---rofekapakugewivinatiza.pdf
    • http://abogarestudio.com/userfiles/file/59050591436.pdf
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/cb7901bae4f3940765187aa3eb297271/25713251772.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087217c00589---fefejozemadexoxese.pdf
    • http://www.contectrade.hu/fckfiles/file/wamiwewiwabisile.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/8c9add773feba2847186b4a8fc48ac62/21313890904.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720352d325e---13777263618.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/t3n1i58iabbeng6iqns2tci7uv/57782232855.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/22chs5nvf50c2cqt1pmdlv17q4/masazegitajugiribamaz.pdf
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/136fabc3de50d97c8f8b2dc2750a90bf/39749483273.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce66f3e2de---fajiri.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=hackerone+ctf+answers
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2cf.bin
bea8e4090dab43094c2869f9da06be64355ac5ed10cb5f1f3a4bc4bdbd5b1048		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CF 4960 bytes
font_01_sfnt_off0000f3d3.bin
3d35de3251fc4946e241bac4510dbe3a24b3f868512611e61a37752c991676b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D3 11556 bytes

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