Malicious PDF — malware analysis report

Static analysis result for SHA-256 959197b0c17395c7…

MALICIOUS

PDF

75.4 KB Created: 2021-06-24 14:25:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d558a15bbcb4fb0c68698bb0cddc444 SHA-1: 86394f93f6408916732082a541eded2e22017af9 SHA-256: 959197b0c17395c7e372761dbe4c94b997f9a0a181f1112992a27cbf602c37da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, appears to be a lure related to a medical device manual.

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://garglob.ru/uplcv?utm_term=roche+cobas+8000+manual
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0755a97e06---widosufepuvagepufodenel.pdf
    • http://firegallery.ru/img/upload/dupofabudasajel.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16094bb76ee6a5---dedipunugi.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/5kuofg7tl65bp5shr79uvi69oi/vepetilotivijawibajibagiv.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/3610fa4e02537a68a79935133f522f07/jomozosuwujezemi.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/1e352f773c9847c9bf582b780cba43c9/rudopexox.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/gcnaig1du7f8s1fcissei51l9q/renugodorubugojedin.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/8354670f508a8c225685e1da5c3d0a5e/xasamezan.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082477c2217f---ferekomurexujupiw.pdf
    • http://kawoka.com/userfiles/file/wadate.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/d47165c8b06bc5f2cb69973eb737a9ac/21652590682.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16088918dc3088---regire.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a03a6932308---44125801342.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/gg68kg0f4v2ocraou682mjnemu/nesevorasug.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_off0000e696.bin
228077647e740f3a0372003a5c8f25c61ffcd808f895534d7973c1f64ec36306		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE696 5424 bytes
font_01_sfnt_off0000f8e3.bin
36d126503dda0493de6e3fb44b7bfad02d48e309fac87d8dcffccdcf1ff65dfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E3 12308 bytes

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