Malicious PDF — malware analysis report

Static analysis result for SHA-256 8558c72386c57c19…

MALICIOUS

PDF

87.6 KB Created: 2021-07-01 09:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b3abeb60cf7c59802f05cfb1c941bfdf SHA-1: 0b09d951618c76c756357b75ca5531a3e3f49e7d SHA-256: 8558c72386c57c19ee3f6ed969dd7395c2ab8f0a6c71714d86bc09cc05225d2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous URLs were extracted, many pointing to compromised WordPress sites, suggesting a link farm or redirection mechanism. The PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://infrive.ru/uplcv?utm_term=is+ovulation+always+14+days+before+period PDF link annotation
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7360cebeb---warun.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/c712e8c63bd60a707e3dc302235c33da/82056358087.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/156f729a1cf829e862d8b1a88532ee53/29619883140.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/b539dcb5078782d260afbf2346798ae4/56006893473.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e98c13cbf4---bivudolomujir.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862f6c48f4f---ruvire.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/gefeti.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/86693576064.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/6f13d58bd0485996a6e206a3afb180e7/manisupofipowiz.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/959567b321b374491a04d49bce53055c/namoki.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/7abcf74b5417e26f9faf26172cbe7107/koteroxuragosilunoxezofiz.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210612130121.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/45i30bi17okrvq9e9fmfo52au4/buvawopagapevunududom.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/39527343197.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/63996528779.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/tolanufimijijopelivum.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/lulefenidodaronuzonirelef.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/dugixopogiwaxanutimulus.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/8832010201.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdb9fab6d1---fewux.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e472895ee---9174608240.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/jgc33ma0cpnri6si7vbp5tc755/xonufik.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/qh44cumu33tag5mtm9ie5s986p/37558243218.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_off0000f14d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14D 11080 bytes
SHA-256: 73450100d589b344df0e560f16035444727bdd3b8b4708fa0b57861388ef11ed
font_01_sfnt_off00010b2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2C 16868 bytes
SHA-256: 4131cc3f86d3f88c9d6f98e5bd8e781cdabe5e91d8514a52460ecf465bfa4cc8
font_02_sfnt_off0001373f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1373F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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