Malicious PDF — malware analysis report

Static analysis result for SHA-256 f29432b00bdd9617…

MALICIOUS

PDF

74.8 KB Created: 2021-09-18 22:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8ce55ac62404a2a1dc193fd81dcd2699 SHA-1: 81328c668df1ce8ba57ad2c479a4847a6b2d1705 SHA-256: f29432b00bdd9617ee5bf551d5d59372d110f3ce83da4dee44d72eec70b11317
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document contains a link farm pointing to various PDF files hosted on potentially compromised websites, suggesting an attempt to distribute malicious content or redirect users. The presence of a callback lure heuristic indicates the document likely prompts the user to call a phone number for a fraudulent purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://al-wesam.com/userfiles/files/63712789684.pdf In PDF document text
    • http://thietbiantoanttk.com/uploads/files/tipoxexusorixese.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/toxixebevosudixejuvonop.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/b759973f4d8897bbdaabc79063487159/50410252895.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/b31159ea1bad1736ad43e1e47bce9786/kozozu.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/pesewitekirewar.pdfIn PDF document text
    • https://fleseriuassociates.ro/files/file/tular.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/36385219015.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/jaxapobivofugoripu.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/65168044048.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gulixilizarorafi.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/79496956762.pdfIn PDF document text
    • https://alutat.com/data/file/60703797739.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/q4c0j1m754csgjf35eu0520b2s/30674250986.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1613663c9b0368---21320986827.pdfIn PDF document text
    • http://penzion.sarmo.cz/Images/file/68462229396.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/wivimosutabarawutut.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/10290003324.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/lekusuzojaxuz.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/25203553443.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/waniradabe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=naruto+in+ppssppPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A4 17384 bytes
SHA-256: d473a28639d6244afd1fb1c704a384bb847780bccaca1dc93b9914f7586a1724
font_01_sfnt_off0000ef84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001079b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079B 10144 bytes
SHA-256: ff1741088b7073e1419881f8a7f488b5f2a16b2986e196b889949ba40cc8c428