Malicious PDF — malware analysis report

Static analysis result for SHA-256 a07b3d89589153b9…

MALICIOUS

PDF

75.7 KB Created: 2021-06-18 07:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0186c2496f27c776f0246887f8017066 SHA-1: 2d946ca4f4204c28ca27bc5b90f7a97673256a5f SHA-256: a07b3d89589153b92fff13714c00094c551762038c0b5958da6bdec7dd7732ec
164 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it is a lure, specifically a fake invoice or payment request, designed to trick the user into downloading further malicious content. The document leverages compromised CMS upload links from multiple domains, suggesting an attempt to host and distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a97042d0dc0---1046989435.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcc441f476---vulutesegotikifeges.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608abf3045a1f---88559437779.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084d42f9dcce---kepox.pdf
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/54522555219.pdf
    • https://itracmediav5.com/ckfinder/userfiles/files/94116719744.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//suzeruvunenin.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4e842b7c5---20556563975.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/68c0a321a0c5dbf1c3e1c141fb14e12a/lelek.pdf
    • http://austria-ex.com/images/blog//file/xiwixawutoj.pdf
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fd31d3d49---tobikewinonaxadarakofav.pdf
    • http://happyhanool.com/ckupload/files/nuvixilu.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/b81e60ee67a40c3eb768ef9924486036/71116326510.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbc6c7e722---1205713471.pdf
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869bfeb7a1d---25208510396.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/3bfa0294b5b68f0d9721c763dc0b1075/xapasurapegef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=roblox+redeem+card+codes+2021
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5a2.bin
55073cab46c3a7d0adf34d8a50ba795c3ea2f09a4b36c0fd39aa726544f78eb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A2 5628 bytes
font_01_sfnt_off0000f8b3.bin
a11defac9813d5b4d1c7a860e0e9b3e7c56bfa5b0038f19271c4ca3974e6ff4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B3 11612 bytes

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