Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f386dbc91e10e0a…

MALICIOUS

PDF

55.0 KB Created: 2021-09-23 09:16:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 046ce6b804b610370fe738820c682203 SHA-1: 244e4de2e3c46c6524421a90cd8c9f24bd15b8ab SHA-256: 1f386dbc91e10e0a0579e48a940a8eee8686ad324c09cbfa73c011bd274f052f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7697

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://altonika.pro/files/fck/file/49454168709.pdf In PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6604671ad---rotenenegugowonu.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/86775086441.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/besawidafes.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210904004308_1899626140.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/rafonesajelugasarota.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/4dda7b0014d730b934ec443494fbbf04/27588106466.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/46941479464.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/71256308741.pdfIn PDF document text
    • https://avflash.nl/upload/files/wafobogafif.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-19/20210919055918907185.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210914040747_sjekk7.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22177454337.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/24280472800.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/69709195683.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/tevanigavuluki.pdfIn PDF document text
    • http://spbi.cz/res/file/wuniziseduzozokegiwe.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/jedavukinigu.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/87c1a6653fc3156c0601656469722f1e/zimob.pdfIn PDF document text
    • http://clainvest.pl/userfiles/file/kagowaweboraker.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/daritunepekuxuzekodijil.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/95393104438.pdfIn PDF document text
    • http://erictex.com/ufiles/files/87721459723.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=coins+in+pokemon+go+gymPDF link annotation

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