Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c751d3af94c1921…

MALICIOUS

PDF

77.9 KB Created: 2021-06-20 14:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b8a8b42980892243d0e8d11d9b8e869 SHA-1: 6b91363b91a11466c85740fc3d27ba57153253dd SHA-256: 5c751d3af94c192156f0f5f0d42a5082d1508a33303665041a8880881917ec29
156 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. The file contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign, likely using spearphishing attachments as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/i3thu735acckp1o4u1srop9i9g/29651189235.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/kfh9fdvv2piq8sh7eccpe8o869/xujisawatodujujobe.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074919dc4612---6830468556.pdf
    • https://diaochue.vn/userfiles/file/77480210210.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/7k8h6cgdpv7hdgf504mlufe4cj/vojakerodagogawazaseg.pdf
    • http://hurtmar.pl/Upload/file/ruwil.pdf
    • http://apexibd.com/uploads/fck_uploads/file/87220671961.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/du34tndcv4v5gksn4g1765hin2/21898551758.pdf
    • http://adabaskimerkezi.com/upload/file/25310724605.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7569d31c5---linagixutugo.pdf
    • http://akinmedical.com/uploads/file/69475065132.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a77a1291925---zonizamipanuwegusezigigod.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cda8ab0cc9---9567667477.pdf
    • https://syteq-pro.com/userfiles/file/gagewotet.pdf
    • http://garderoba.sk/images/_file/58986180101.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=question+4+paper+1+english+language+example
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5e0.bin
aadfb35f87da2c1d49eb9fa08e15e7bf37da4e01580afad0ff2aa429e20c4de3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E0 5384 bytes
font_01_sfnt_off0000f80f.bin
47b6c3407c61ac47edb4132155d5dcd296f700247497cd5a4009cd6493429fdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF80F 10584 bytes
font_02_sfnt_off00011bf1.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF1 4324 bytes

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