Malicious PDF — malware analysis report

Static analysis result for SHA-256 28e35efef9ea733d…

MALICIOUS

PDF

48.0 KB Created: 2021-06-29 07:24:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b824470f6843a7a2ad906e66aaef30c5 SHA-1: 01a79f46caf11273c43277b1c0660622d0535eee SHA-256: 28e35efef9ea733dac319bc8b4d682f36a1934dafac12b3b3b79c7b7725bac0b
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9210

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://yuss.it/file/42414688605.pdf In PDF document text
    • https://abofahed.com/userfiles/file/2577565347.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/f1fa85bd26241d93fcbc5809abd68604/zererezukirojele.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/o5dtip39frrlhesp970bv4ro3s/zapug.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/dogilasane.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/439e2ec7de156dc0ceb03e7db0998f39/54353126520.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/cd63pl7kg8si38pdkth1nmaau1/50709498874.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/88093319531.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/85675371081.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/mofesabaxukagokoxalubuni.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/2sm5oskb98eds2hqb1vhrcct45/97625392069.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33554183686.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/2g1m7r9fbsrnllnkj6aaks2osd/94636068546.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/tomen.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efc218e218---nivunabuboju.pdfIn PDF document text
    • https://smilepaper.tw/archive/upload/files/wonewanexikonikap.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/18153368375.pdfIn PDF document text
    • http://51-lq.com/userfiles/file///xezojefafu.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b63d2a8ebc9---91683636121.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/58394975834.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce2f484ff3---27976802806.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/wuravululelawoxejuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=python+programming+for+practice+with+solutions+pdfPDF link annotation

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