Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ae76d0c82551259…

MALICIOUS

PDF

85.8 KB Created: 2021-07-05 14:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 2d00af8097ab48fb99296b4a102fd57a SHA-1: e66e5b545ae4a134a2a7d38ce03b21d1bf049888 SHA-256: 9ae76d0c82551259d2168ae927e35303e27e9ae182f0115c4cc033614785a595
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, with many URLs pointing to compromised WordPress upload directories, suggesting an attempt to distribute further malicious content or redirect users to phishing sites. No scripts were extracted, but the presence of numerous external links and the ML/AV detections strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://ldbell1965.net/clients/85689/File/27175819282.pdf In PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/4658875531.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/6c1e3306da692164511e3cf3fb2b077b/47361081981.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e0c69bb75---39928117217.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/deroribijawuzat.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/036bbc3184080c702badc713fa1e3d10/71550354796.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/378d251c6cfe0e4762b2ffdd9ba6e656/38930940877.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/bg67pet72d2q9gmfouiusub3nj/13643660047.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/biditakozebul.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/577646789367fdfa1bf72d35d39ac0b5/mexixinidomov.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/nitebewajum.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/27203894198.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/3ea97a3391e3a918b9c6f8eb6325f632/903867416.pdfIn PDF document text
    • http://jarosi.hu/files/file/90392548062.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/viloropijosux.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/c72ee267771920752cd9e7a82f441ec0/sakirip.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073d958a5794---6188061081.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/3d334fe191c38e85f50fa615139ab207/96030633959.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/fe0b9b0a9f6763e647914d9ee8e57e78/gugawumumitidusevezolapom.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/68545978326.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=double+four+in+hand+tie+knotPDF link annotation
    • https://lapdonline.org/file/muzowozivuroniranef.pdfIn PDF document text
    • 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_off0000ece6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE6 10616 bytes
SHA-256: 7e599deaf8f45a14432b82e6a945901e9979d8e599ecf681d35a201dfc79d728
font_01_sfnt_off00010504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10504 17440 bytes
SHA-256: 2685261c2e2ed92f26379b37676a0c26dd5c3dfd01dbb13c1c6e6e79d631d335
font_02_sfnt_off0001323e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1323E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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