Malicious PDF — malware analysis report

Static analysis result for SHA-256 00d7bc9f216c54bb…

MALICIOUS

PDF

72.3 KB Created: 2021-06-19 20:16:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d99b50fd44888bec02d52783be85859 SHA-1: 78d2bd17dd3ddd2d412de034766f24f10c6a5843 SHA-256: 00d7bc9f216c54bbb5718947634eefe184b310c5816de8b247ba8a549775c274
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute phishing content or download further malware. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://pistant.ru/uplcv?utm_term=why+ionic+bonds+are+stronger+than+covalent+bonds
    • http://lifecare4all.com/upload/files/48753448950.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160903020d549e---zokumaxidesuvawozimilige.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/0hjcoj9ngf09bha1dg8ehffo31/17313355709.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16071fb0e57ab8---34726985244.pdf
    • http://ekolojikweb.net/upld/userfiles/file/fugebikemopujo.pdf
    • http://automotiveenergy.cz/userfiles/file/40958476368.pdf
    • http://zimaletto.com/uploads/file/xunoxolukadotorosor.pdf
    • http://hkt-optics.com/hkt/images/userfiles/file/mefirizijopewenegasuk.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070859d9466c---lusefuwewavuluganon.pdf
    • http://nw-line.ru/generic/uploaded/xorizu.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/okil3ovsu3k0ebrtvh8eag7n91/1582122697.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9f5b0a303---71436802446.pdf
    • https://nhachoxebus.com/upload/fck/file/lugegavarijamalexenavo.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/77a3327467850c7a1f91af375e5557a6/wivugurabikopatim.pdf
    • https://33mobility.net/uploads/files/13618232499.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000dcef.bin
ad2a12f30b9d243bf2be8398d96ea37430c944f43283a551d6d989e4ba8465be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEF 5516 bytes
font_01_sfnt_off0000efc2.bin
e01aa5ddc860f17fd8171ecb698f57da8e72c67d3015da3cded26696e943865c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC2 10624 bytes

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