Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c6f5940307273c4…

MALICIOUS

PDF

77.4 KB Created: 2021-09-02 02:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e9861332131ce4c133e4c656ebe17c8f SHA-1: c478311ee45ec20abc652a6508d5e86d8a62a116 SHA-256: 5c6f5940307273c448a58b0bbdca13562915729d792b4a7772d2412bf05bb9e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or scam attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://drafthe.ru/uplcv?utm_term=ie+stored+passwords+location PDF link annotation
    • https://atiksigorta.com/files/33397577989.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d4492f5942a---gobatewebirazovad.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/lefiladibagu.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/01e3ee68e6e25ff878193e1b158d8746/429693198.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/kafokidafatipofumemojil.pdfIn PDF document text
    • http://topstec.com/d/files/99449379957.pdfIn PDF document text
    • http://girisimcilikproje.com/resimler/files/vazedux.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/69386592569.pdfIn PDF document text
    • http://k1a.ru/images/files/file/28129941594.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/80116705075.pdfIn PDF document text
    • http://lyonsmcafeereunion.com/clients/a/ab/ab8eb7fa8d7cf94b91f67e7e346c80ed/File/duvarevozefez.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/49120202323.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68919014611.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b467bca5a3b---74468408773.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/18202825322.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/c07018506a5005d174345bb7514e8611/juzewajilepurig.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/2219aadeaf9638112d468f6f9659e682/87669618041.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202108290355429415.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/2543712886.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1611dc9147b856---laxozuxokovotimozepowof.pdfIn PDF document text
    • http://truthtube.com/UserFiles/file/67839008674.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/wanuvakufefadimoxa.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160aabc849c3b5---86808902695.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_off0000c652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC652 10544 bytes
SHA-256: 9fbbfff8bdac6b906d6cafd27103ce4e0bf8c97c91729db177048b7d3bda0dec
font_01_sfnt_off0000de83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE83 18184 bytes
SHA-256: d843e702f180ab89c6f733f2c3f2e9efe8a10791fe615b02a154646e39527c9b
font_02_sfnt_off00010d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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