Malicious PDF — malware analysis report

Static analysis result for SHA-256 80c83e7e68c63f5c…

MALICIOUS

PDF

76.4 KB Created: 2021-08-07 15:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9d83c7522cd12b935a74598de1f8abc1 SHA-1: 691c0d565909840c337ea7552fc0c2a29eb8f157 SHA-256: 80c83e7e68c63f5cacdaa50596a23f7d3da72c666bdbf2bc4f53d19e53b9c9bd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggests it's designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a link farm on disposable hosting, likely used for SEO poisoning or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=takeuchi+tb240+manual+pdf PDF link annotation
    • http://bdn10.cz/files/file/votefomizukiv.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/b7db2ed212f16285f1c97c3497c602c3/78704012570.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/jowugujufelebolokorina.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/e76674802deca143d365ab12a7a65f48/51900046638.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a91d8d4b38f---32761455124.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/08/06/61631853666.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/3o6ckblfh9p5pbapvk5c32h822/65169903223.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/luxizenumokur.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/71435120781.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/t8i8vo1so20svlbet2rof1tfn2/64476602232.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/6325440600.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/famozetazobowaxuse.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/22067926112.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/fuduzikanafalidafonoteb.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddc26ccc3a---59950424869.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/bujikewerobefiponobikupo.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/miruzaxezesabu.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944a99ef23d---jawifujavunelap.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3b02f26e6a---mamedinuvifemakakeguj.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/xixuziju.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607faa7765a8e---14020052249.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/65082686634.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607899c2d2373---97768518857.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_off0000c3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3BF 17260 bytes
SHA-256: 93b8c95cfc010a651a9e7cc0687f6081c498a0779a4e646fe08486f31d0d91b9
font_01_sfnt_off0000f12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12C 11112 bytes
SHA-256: fdf0a356fae8927d9f7d44ac5c56bf470df165e236c39fc17ee28f19b940e8fc
font_02_sfnt_off00010abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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