Malicious PDF — malware analysis report

Static analysis result for SHA-256 613b677927f687b0…

MALICIOUS

PDF

70.8 KB Created: 2021-05-24 17:28:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 92c638b49a99eef6b4ca6152665f0334 SHA-1: 2104fd9df4bf3d723ae7d86a4ebf08af72452144 SHA-256: 613b677927f687b04fccf1db46857e2cdd205a23d6fa1dd723c2cd7c4ac13dab
154 Risk Score

Malware Insights

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

This PDF file is classified as malicious by ML models and ClamAV, indicating it is a phishing or trojan delivery mechanism. It contains numerous links pointing to compromised websites, likely serving as a link farm to distribute further malicious content. The document body, though partially corrupted, suggests a lure related to free book downloads, a common tactic for phishing and malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609f47ca63076---17860078193.pdf
    • http://animalscipublisher.com/files/upfiles/file/48374824484.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfeeb7a278---97020337410.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/5eac8ab586401ea66688c4cc7bcb00e8/ponekuleguxasev.pdf
    • http://fonnepal.org/userfiles/file/66304294612.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/23f70ef6c052da7f7da6aa94480e5ded/63567193090.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f75ae0c531---fijukigekafip.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/d346fb1cb98165ccc75262a3b4d12d91/54602869783.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/e9229250a9ce652a25daf2d6c78dd58d/62827077062.pdf
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/d64de7f81101fe49b360fa41b6f57e26/fozuwite.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722263bc0f7---muravafog.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088244accda5---paxetorizirekolizarejeku.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8f26184c7---72272023762.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607d767a27386---87866410190.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/397a7285881b1f43e4114f5f1a2381e8/37235608451.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/fb1783e6fb6bb35bc29d57c2c379acb1/24266497433.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=dr+bruce+lipton+books+pdf+free+download
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da73.bin
f8210c933c4b8d99a4d836a631933808845f2096b941e5404d573a66d7bebd04		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA73 5328 bytes
font_01_sfnt_off0000eca9.bin
847e3d006e6ea8b7e397af79d8e29992e8dd2c6a95f802cd85ab189d3fdd948b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECA9 11708 bytes

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