Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5ba8e58082563cd…

MALICIOUS

PDF

80.5 KB Created: 2021-06-14 04:38:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 7a64a02a8e4f6ac3e9932bea2e193314 SHA-1: 077288a6288ce81d52eec22423446cc5380bbe05 SHA-256: a5ba8e58082563cd3e257a3a3fa0ed10469d71d718ed1bd2451067350aad61cc
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely serving as a lure to download further payloads.

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://oniceh.ru/uplcv?utm_term=significant+figures+class+11+physics+notes PDF link annotation
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/e80aeobbt938kvbm71unn0lkl1/34782649652.pdfIn PDF document text
    • http://sweetbasketsbyjackie.com/clients/864293/File/xupejiro.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/5acc2c9e8c099120927aac7cd40321c3/57705556611.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160748a0e98ea4---rilovolimutu.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a23fbeaedc6---gugolefadi.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b5474a306---kubomebegiviwozivumukivur.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160c593b4d045e---46478248569.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/sabakum.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca0cee1ce0---49455524198.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/vejetivose.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/tarenakev.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/gegop.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072a07071e97---zidajamowig.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/ad6c853fbe4b74e2b58ba3945a515cc0/13412099131.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/52647876077.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7dc1328ff---gekolamekeludedolaxumenew.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d609bfc89---vabutolilezeseligopuz.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/6mr2n8p7bqkidmcahdlkskr076/pafumuxuvizukiz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7F 5416 bytes
SHA-256: 70ced6a41af1e7e9fd22764f2f9e3ccf16693fe7c45dd67f2b618d0bb287d731
font_01_sfnt_off0000fee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE6 11568 bytes
SHA-256: 59c92b270c1311757149d12be8765bdd0f8aa97ae671ded0bd3fa0db6e6d6781
font_02_sfnt_off00012622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12622 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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