Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1cffb40c01bd6b1…

MALICIOUS

PDF

59.7 KB Created: 2021-06-07 18:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a110914b723100787b1763772b765dcb SHA-1: 2913ba52c6d3021efe10514364ffdc402b998cc3 SHA-256: a1cffb40c01bd6b12c8a8d025fcbeaf18609f104e08b1750101fbca6c40dca57
124 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains multiple links pointing to compromised WordPress sites, suggesting it's part of a phishing campaign to distribute further malware. The document body, though heavily obfuscated, appears to be a lure related to biblical questions for children, likely to trick users into downloading the malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9672

Heuristics 4

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=100+preguntas+de+la+biblia+con+respuestas+para+ni%25C3%25B1os+pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160aea85f01966---zuvarimezosikekizonubi.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/mbtk4peenp8vrl4tovia0k5vmk/vaguvidifatojuw.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6d1927e43---99028855252.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/db22fa8b4a5eee8698728618579cd73b/nirirej.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816cd11d3e0---xixipem.pdf
    • http://longvu.vn/Images_upload/files/lexuvofalesavonabim.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/ec6a99c78f200ca200cb9a7b7ef7ab59/lopagobuvasavagurorununa.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/cd35dfe9731a072833dcce7d42b5f3bb/puvejelo.pdf
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/lifadofum.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c454c2fb---vopikebovenosifidagodow.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/43990256766d1225bc9602ef4b2949f8/73656629347.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712eb828261---23628232858.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/d1f492fc44109737b5ef94ad0efff06a/bamurikixupebedimul.pdf
    • http://amoy-art.com/Upload/file/69315220667.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/8aa98v2gn958fiftip2ci224e1/80159817096.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e065.bin
3175a9496f31c3ebe646e21839988f555639995c390cbcffc9072fde7912e25b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE065 5656 bytes