Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1df0b67750ab920…

MALICIOUS

PDF

71.9 KB Created: 2021-04-30 07:29:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aebc6942d5334a4a580ba6b9b9732ce2 SHA-1: 99fe81c57b31e39ef3c0a8ff1bcd813080b3fb46 SHA-256: a1df0b67750ab9205bf335637514811b5b959b85ead53d589d791c504b2daf32
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8179

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 http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c95859391d---wuxolosatalaseroridupo.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/9324102f43c6a5bf5d06eafdc1ade987/71224332875.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/fg1nigvee83mgkinedmfal33b5/37426606477.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/tot0j2sj13bc3a648hlf61p8n1/mofimawuvetanejosiwugom.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac816c6df2---85702100590.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff9c0594d1---zugekowepomowisabawu.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/0837768d0d27c1c31dc42495a792e5de/lizekeborobobagasa.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/90ff90b307435232707906a7377a0372/59792669520.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0c15667c2---vadepunizojukovo.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784ed39a73d---mogarerexasirojivuwoseka.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606f56f39ab68---37769829580.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/5d5e991f33f64327bf95e3fd031db4ec/62438317073.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607856602bcc3---towudubekajim.pdf
    • http://alituncer.com/userfiles/file/fajol.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/43338397920.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=croissant+dough+sheets
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f13b.bin
ae5914ec51b4e032e66d3d35459c18c92b8df6eddda29de6e48e64d4d680aa6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF13B 4960 bytes

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