Malicious PDF — malware analysis report

Static analysis result for SHA-256 befa4306db25c32c…

MALICIOUS

PDF

64.0 KB Created: 2021-05-22 07:34:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 85c756be580429f4de10802df834c6b5 SHA-1: d39ee2e3d7d0ed98cd4e2f06db8b383b6a3fe594 SHA-256: befa4306db25c32cb055c4a7e38350b7db994d2fbb6eeeb4a9842fb84c0285f2
154 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8993

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://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b375a93a3---944284582.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/da15803a82b9ac4d514c4f42d7e153ac/lujaxemo.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/3fad0240efdb977d0fa2355040ee6317/loxudapafozaxuxogum.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/09181b2b6c77de6f65e0dadd388bf654/dibemujugalized.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075b229e7b2b---niparotafunobowalojoriwu.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608935ef7a64e---lekino.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607056ed23a9b---tagaxezubobuvalivuzozefim.pdf
    • https://karapinarinsaat.net/userfiles/upload/file/44270537699.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/dhj425phjojevab4kjp3kv50sd/luvudezuxugoxural.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607417d3eef5f---21642593165.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cad5c977e6---32829782837.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a858ff1326c---97621658950.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85c9b900e9---53191093838.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/sldlub4qfcnp17bs86vja4virq/finufilu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=connect+core+concepts+in+health+14th+edition+pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc7d.bin
66645f04780ee1714d7d548b14f8fd46a01e71ee7f1838134209eb3f6a6a988c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7D 5288 bytes
font_01_sfnt_off0000de7b.bin
7512a87333a989afbc311dcab6ee276ae5800a0a501c74aafaa3117ee785bbdc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7B 10120 bytes

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