Malicious PDF — malware analysis report

Static analysis result for SHA-256 202b9885cc852e4d…

MALICIOUS

PDF

81.5 KB Created: 2021-09-02 23:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 736bcc9c2d823b42909e1d8ae41474f9 SHA-1: f558820fb36e389ddd2b1e17e971550563e04063 SHA-256: 202b9885cc852e4d28856c006a0f11fbcc83135568269f852c27f1200c147bb2
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://vidaleve.ind.br/ckfinder/userfiles/files/55809277486.pdf In PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988cfa787d0---zojupufigipasiwajigepalud.pdfIn PDF document text
    • http://drtamerturan.com/file/najovusejezawe.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/71535935366.pdfIn PDF document text
    • http://grhs1983.com/clients/72571/File/68714637967.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/41c7cda63ec1f0e533a71ad366921881/67843716905.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/19813225343.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/5d443cf4fedf606af20cf4588bbf4576/38092747125.pdfIn PDF document text
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/vosegitujesaro.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/zogelemorujisamen.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/tebiluzusuzipum.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/42e1cb6cbe04d9ee1fca0cd4db5090d9/nirirujiga.pdfIn PDF document text
    • https://ottopianos.nl/files/65850254511.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/37905657283.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/pafilawozuwo.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/xajetulowelavikolig.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/besiluwikara.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/c6d80d8b76f0b2e7bd32ce70c0a2c2c1/18321975295.pdfIn PDF document text
    • https://oriontradecom.com/ckfinder/userfiles/files/40181698338.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda9bbeb3cf---zotebufanezikarufo.pdfIn PDF document text
    • http://saxonsaxtonfamilyreunion.com/clients/f/f6/f6d0431f970e0833b0867c311dafb132/File/61434946387.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/850f28ee958a656d1e784a7a65f13e3b/14832674932.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=varieties+and+registers+of+spoken+and+written+language+pdfPDF link annotation
    • 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_off0000d96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96B 10920 bytes
SHA-256: 13724f8e901810a55ec26c2c55640be1363110f2f76d742510ca3cc490d293a8
font_01_sfnt_off0000f2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B0 17556 bytes
SHA-256: e1e66b2e227277c833c4e47c91682ae139af974a0ad9cbffba0581276abceb2d
font_02_sfnt_off00011fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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