Malicious PDF — malware analysis report

Static analysis result for SHA-256 892e95aa6481ec1b…

MALICIOUS

PDF

89.0 KB Created: 2021-07-08 10:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 97450208250ab58ca4460da80b7c0b52 SHA-1: c038024fbe407fcf086318e25650a314d8a1faff SHA-256: 892e95aa6481ec1bb066113518a153b3f287a08ca06de5c6de9d032eb2c3aaa2
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised WordPress upload directories, suggesting it's designed to lead users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a network of links on disposable hosting, further supporting its role as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://ctkupavna.ru/upload/file/39328269668.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/ae534a0ab021d72924efaa6f988974cd/varazenemexorevo.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/d11kij2obqd4m93b6krkvo6a9l/44513845020.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/848rp92f1m9mssq2b9k1qs337l/tuzuditujefemopavebor.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/is6si5be4de6jdje3fg39fugg4/fasexix.pdf
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/i27grl20e65risq0r6ne21o9ga/nenuxovijugonemibe.pdf
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/43115464065.pdf
    • https://airbays.com/userfiles/file/18782812548.pdf
    • http://slhs1958.com/clients/18590/File/kuzefu.pdf
    • https://kompaspt1.com/contents//files/43422762635.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732e4150f30---mofimojomozike.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608315dc2a96d---64124496020.pdf
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/14024294097.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c08b2d7e5d---22925427884.pdf
    • http://nickels.design/ckfinder/userfiles/files/44504792880.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf652da0f3---tolesevajewuraluro.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/78b745a3c53381f6f777621b3322cf2b/39400577576.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16095edcb1bc8c---49958508201.pdf
    • http://akinmedical.com/uploads/file/32409805241.pdf
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/c1dbed59ff8481243af6d9a2f90e9e74/67378946761.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/2o8qu8k9lrovnat3u7v4pofu3o/43876863507.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943e403ce1d---62849396312.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/f165f870be5040232772aa8d24fb2762/86576971146.pdf
    • http://remont-elektro.eu/archiv/file/53654182474.pdf
    • http://renovator.cz/files/file/wixibeketenopozilazokuga.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=letting+your+dog+sleep+with+you
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f658.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF658 16792 bytes
font_01_sfnt_off00010e6a.bin
5952c720052063af56cb66bbcfbbc2af03ec169cd64cdfe30a21c37d517d22c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6A 18324 bytes
font_02_sfnt_off00013e1a.bin
81d5b132225f9b059a12883d77b0282d843b7d2b2d3d56bfd390eef0016e2409
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E1A 10768 bytes