Malicious PDF — malware analysis report

Static analysis result for SHA-256 929b8c6c9cb0891e…

MALICIOUS

PDF

84.1 KB Created: 2021-09-20 06:52:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 794e93f0250738f4d62e9c5f38817216 SHA-1: 2c17bcdc164b6b66614e69f3e3b1211b6b11d4f5 SHA-256: 929b8c6c9cb0891e052ef3ffd272ec5b796a9fad151421a954737dbaa5e125e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites 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. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a malicious document, potentially leveraging PDF vulnerabilities or social engineering.

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 https://wastran.ru/uplcv?utm_term=can+you+use+icloud+on+android PDF link annotation
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/fd250889b6e6fad1978490a7db745f07/80472941043.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/fuvobevomexitufomapulefa.pdfIn PDF document text
    • http://harlit.com/upfiles/file/rawov.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/tawigedijewig.pdfIn PDF document text
    • https://cape-electronics.com/media/file/25989841982.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/jigezanuvojujufepadaj.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/2267791877.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/44983362084.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/xikatiwodelikemilugebu.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/gusikuxisakoxetajalubedok.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210905034503.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/24145039089.pdfIn PDF document text
    • http://cyuansheng.com/userfiles/file/jabemogek.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/kewedotusefasari.pdfIn PDF document text
    • https://digireg.gr/upload/84145995215.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/28470050976.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/tanaxomudalelivot.pdfIn PDF document text
    • http://0965818789.com/CKEdit/upload/files/ranasafuripagibisog.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/ee9ac79753c79de8d26753976eab63ab/49945043770.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f08eec07ba---puwivopujesopatinowewa.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614741abba1d1---wuvupixafukeposazunej.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/s0i6fo9vo3im074bfukpt8ocr6/fovisopo.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/18516381395.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/mokatadakigenotexidi.pdfIn PDF document text
    • http://plise.org/userfiles/file/81133995209.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_off0000e2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A6 18944 bytes
SHA-256: bdb30b77febe4c4109b9cec513534e3a5184c82ea2346765084f75126489e95f
font_01_sfnt_off0001127c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A93 10508 bytes
SHA-256: f10be9753f2eea9759a6ada24562276a36fcbc8b58de40ff7017b3af3535a0fb