Malicious PDF — malware analysis report

Static analysis result for SHA-256 c44b7a86caa2815f…

MALICIOUS

PDF

57.2 KB Created: 2021-05-27 15:41:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2bc437d58fc31a0fe3af375e0ad55f81 SHA-1: 54ae9a801696800b96852df89a7a745ba45771b1 SHA-256: c44b7a86caa2815f36dd281ebd32f107faa1181d4c6a30744d101574d1e93c99
154 Risk Score

Malware Insights

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

The PDF contains multiple links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8695

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/3e2eeaa4c536bfa1e5325508db6073f9/fubuzezuxase.pdf
    • https://activepymes.com/pub/file/xosevataragujebegawonopo.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853939e131b---pugiz.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/111503575941e2b8c8d326f5b625269c/46573014161.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708f401919f---64910089561.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160743f504c66b---punasoz.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/31a21f7143c84f4f17797d6bf2a1f7e8/suvifinivudufapitalazutig.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b33f08609a---55396664396.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/d5e3de2ec8f80d0fa9c93ff8f286b3de/gabipibuletamivikaxe.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725b2f99b8d---71609972770.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/8b20aac099cdd2d516828e9b9fdb8351/rezabomekarozowapuledudaw.pdf
    • http://imaginove.eu/data/Files/lefikilep.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/037b9lek4nnjk8bk42dehk1jpl/71585020079.pdf
    • http://czdashan.cn/uploadfile/file/2021043023555473499.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8d55460a4---1424012547.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/a5177cad8643236f704e34311f4b4620/28082558642.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/qq9mids8j9pnlsm0oirhuk2t75/68643203091.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc04c74296---dafadilefilefuwatajulol.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+use+cbt+for+health+anxiety
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d70a.bin
14ee038d9282c9d546f7a8e1f8a873382724c5d1d93ec236e99fddbff8eb89db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD70A 5332 bytes

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