Malicious PDF — malware analysis report

Static analysis result for SHA-256 676dcb5bf199d1ff…

MALICIOUS

PDF

81.6 KB Created: 2021-07-23 18:15:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cdbef95080de0afea01ad35cad203724 SHA-1: bc949f009616530fd8e6339a394fc6c267343b15 SHA-256: 676dcb5bf199d1ff7f61e982e680d0d4bcb150177759778e49f2960cd6c3c8de
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The heuristics indicate the PDF acts as a link farm, with many URLs pointing to compromised CMS upload directories, suggesting an attempt to host or distribute malicious content. The presence of external URIs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160919dcb76ddc---maredobekibelovadiw.pdf
    • https://majorsagilekvaros.hu/uploads/file/35276714258.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160d4df2fc7add---68024262406.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0b2aeec4f6e45d66134282d9394abc2b/64457252578.pdf
    • http://staples1981.com/clients/b/ba/ba027a536d51c1d997ee76cae6dc9017/File/tafijewidukovupimaxik.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f4b49a0344e---26603975894.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/scsstnjg4hm5o7jejoc8skduln/64108263702.pdf
    • http://arcomproltd.com/userfiles/file/nonujikefinexonezukerogum.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/vt3qdi72qcj6f966s0mg8jh9en/9683613818.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/e38fa377f8af01a8c482b2441050a279/84052081456.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/f833fbb38acdcc959e5c00610fda0d4b/jotelikozexufomo.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/3c86bc9488254afb5107b6545bd3bb29/29864658057.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160aa60522354e---vilasobibexamupututab.pdf
    • http://daydreamspin.com/userfiles/file/faturawodot.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c32e39197e8---24071819230.pdf
    • http://izdepskifamily.com/clients/1/1a/1adacdf247316bc4617b3617d965acc7/File/bevinutoworolopowozeribe.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4f3b82d5e---25721872489.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9529b5d09---vibisutazipewew.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be642e31912---xinimipaxujutem.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/6339c1123ea3bab4e786501ce25ddd16/68799588415.pdf
    • http://yacpa.org/yacpafiles/file/xekododafekev.pdf
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/2d2c47c92b21abf0c6284654538a7e5d/teveta.pdf
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/748qbcj8d6v9flst4k7p594aj0/nojaxedafibukijoko.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607587ce82678---sesut.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=lista+de+verbos+regulares+en+ingles+para+imprimir+pdf
    • 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_off0000d905.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD905 16792 bytes
font_01_sfnt_off0000f11c.bin
b6786ad3eaf5ba35685bdfcf4f670242db8741c0561e01001d6602d5b1b64dde		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF11C 11104 bytes
font_02_sfnt_off00010a8d.bin
fdb3e62617a7d2f9f7fd5cce317b164a79cb1d9c6726a4267d892dee8c9f064b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8D 17260 bytes

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