Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5a8c79dbb93f522…

MALICIOUS

PDF

72.6 KB Created: 2021-06-13 10:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 88536b7db71226711abe16e4ea02714f SHA-1: 8093ef31c3dde392934a796b0428ad9f8be9505c SHA-256: b5a8c79dbb93f522c417bc141fc3b4be92c34ab2c2f5d08d7149b1f677d8c22b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs and the nature of the link farm heuristic point towards a tactic of redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://laborke.ru/uplcv?utm_term=all+batman+suits+arkham+knight PDF link annotation
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/5gqv8aeak1g9kka7tehci67aq6/75213132787.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/e3ssl1gabovhqth874bnhjf9ap/vorisapomulum.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/78732785625.pdfIn PDF document text
    • https://pasarantogeldua.com/contents//files/ropozajagikaka.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/70026639371.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/14535230897.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a65c8c54134---52345073298.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/5969189501.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/25873137812.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/a46d890aabe4a981dd8e23e13220daaf/2745024606.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/ecb8tqjdrha3kae449krlvo530/zupebipufo.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/97qm0vgtuvbemdqqijpdff1v3n/nagut.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/05cukhalpj6ip5uusu0als83at/likozajoxumasovamapudaba.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160c03abe742be---ginodojotemokulorutuburaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB4 5292 bytes
SHA-256: 3bdf765f64a737dc484bdeef83ac115b1deb368d4010e2858b71c77b9dbf35c7
font_01_sfnt_off0000f086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF086 11560 bytes
SHA-256: 1026ac661712894731514f59a60a57b8bbe642312f6cc73830df7ba1654542ee

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