Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc0c9d130c27b49…

MALICIOUS

PDF

96.0 KB Created: 2021-09-04 17:37:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fe46ae7e2b6272cc177dcfab90cc433d SHA-1: af3e8389838ad9097f8fbc4c48f5a5f509412624 SHA-256: cfc0c9d130c27b498a5b6cbd44321f32db6500a2832b4a84a3cc34c388208f55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://catamma.ru/uplcv?utm_term=ipcc+full+report+2019+pdf PDF link annotation
    • https://aihr-iadh.org/uploads/FCK_files/file/lonupurilemekaz.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/5704885800.pdfIn PDF document text
    • http://zonwering-belgie.be/ckfinder/userfiles/files/denuladaxafebumuw.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/kemebitarofane.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/72339918830.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/15419055165.pdfIn PDF document text
    • http://clarkhigh72.com/clients/3/34/34275c7d49a174b5f6cf03bf5966da6c/File/moxeluvupukelalitepeketof.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/f8f845e3b65a0867204fa4e26d63859a/sijipeluvejodepum.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a39a8701b2b---56243006187.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/78g810g3ncogmcp40bma3v94i1/61113790833.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/gorixulikanazitu.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d67665181d0---getujupebagumimifuzar.pdfIn PDF document text
    • http://fxmeat.com/upload/file/303a3679835e8ebc1308da8972180a19.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/41464899218.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6bf583adc---sofubapevofaxigajule.pdfIn PDF document text
    • https://emmaushuis.org/pages/24591231615.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/memotol.pdfIn PDF document text
    • https://baongochoa.com/upload/file/zixosesujuvajejalasunax.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/2f87410d089e7af42dde1870aa388fba/95460655062.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/54a932aa08b58df9b997e4a3d22cd4dd/22057353233.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/96767264541.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160855fd2dcda6---7621895721.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_off00010dfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12611 10600 bytes
SHA-256: a6770d09928c7184c00ff808f19b827c6ff6bd302bf9d36823098a67d36d0d25
font_02_sfnt_off00013e83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E83 19748 bytes
SHA-256: 7106ed9a185e0985827ef56006e943010371419d431bef9b280fdb4364ece524

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