Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f9afd703384234…

MALICIOUS

PDF

85.9 KB Created: 2021-08-02 16:11:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 91e7249625424f013cc6e235ff141712 SHA-1: fdf255bf800ac2953d4bddfa5fb2ac9b6e4cadf4 SHA-256: b8f9afd7033842346cafc02cb47c24d17c87494d34d6673954e965265aee7266
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites or disposable domains, designed to redirect users. The PDF structure and embedded URLs strongly suggest a phishing or scam attempt, likely to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://medvor.ru/uplcv?utm_term=ielts+writing+task+1+line+graph+sample+answer+pdf PDF link annotation
    • http://gtshotel.it/images/file/66230477066.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609deb463dc48---gulexuwojoxofibali.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb39b9d79e2---55842456296.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/r1eql8mj2j5a5r6roesj6vhqqa/taletewawedipi.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/gokogeko.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/85178865003.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b84deda628---folidivisama.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/fowufapena.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/gebapunevunuj.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/9c1f64ab8c38b8eb251158e5504af96a/bexaweveribaz.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/45865bb478e256a8baafc99a57a376c9/94767512596.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/62851599398.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/sadawir.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/xemifu.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/jujagasowol.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfcb4c2199---pubikaselodabebimisidab.pdfIn PDF document text
    • https://alariel.be/userfiles/file/57982381608.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/vabibezorepasabipuses.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a109ae064ed---tupigomudawavuviwipixes.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/sv5r96krhp6cn74tjtdfrhr2tj/69133318300.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/93071135323.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/4e2668b2db1951ff276de363f6b06a50/45872444311.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/okg2g1j251m8k9jis3lae157h4/golofopu.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/20702406521.pdfIn PDF document text
    • http://laduses.nl/image/file/loforelepukarubageri.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffd641ccca---zujogubofozepile.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/zufisirejebewaxorizowutib.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_off0000eec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DB 11008 bytes
SHA-256: 8a4f611df14ca6abbc6c8ae111afc093e9eeab967aea618e787121975fb61f70
font_02_sfnt_off00012018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12018 16012 bytes
SHA-256: fedb4e1ed6ad79684175cc92f02e9729ec85ef94af1761989139721f26ce6776

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