Malicious PDF — malware analysis report

Static analysis result for SHA-256 0901b573eda4d840…

MALICIOUS

PDF

69.2 KB Created: 2021-08-26 10:29:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4979874e36c2de1934563df077020d4f SHA-1: cbd614969a18c06a06e6ec2b99d083197a789f03 SHA-256: 0901b573eda4d840967d6c3d179fd96463ec26d764e7ba9e611158b6da686a90
154 Risk Score

Malware Insights

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

This PDF file 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 many URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The document's structure and embedded links are designed to lure users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7757

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://pcwenhua.com/uploadimg/file/1628401031501024154.pdf In PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c5c1bfd5b---wamemesumegitiwunuvemo.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ba24c6f18---17348127858.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/pmjvn032ud9ca491da8taeg7i2/75750948559.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/6ac9a4a83d774ca167e4e5f7762d36b1/gidolutuneloxaw.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/37331870512.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/42043062491.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/48286082874.pdfIn PDF document text
    • http://iphysiology.ru/upload/fibimagexigun.pdfIn PDF document text
    • http://surtek.biz/image/files/20150119_012945.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160878ae18ea8e---28943803481.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/xudozawib.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/71283943435.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/73689821704.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f10aed0b37a---nokedufarutubivagud.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/12544281277.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/ragileduru.pdfIn PDF document text
    • http://orderkai.com/uploads/files/tegiponal.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/68302747254.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16113bba31e152---76334982170.pdfIn PDF document text
    • http://alwaysfavorentertainment.com/clients/879371/File/tifizojebuwow.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/f73940930f71f5adf291fdc98b3609a7/norodegaworusaxijilenubux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=ss+of+hyperglycemiaPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB4 16736 bytes
SHA-256: 9e6594be0674cb5a5225ebe33eaadb042ad1ce8249832eeeed9bdfc9991d3e63

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