Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8f4f6eff763286e…

MALICIOUS

PDF

71.0 KB Created: 2021-09-02 19:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ffc18cb7c3654789df1ab117100f517d SHA-1: a39735370485a0558aa28495f22fdcef7e8245ac SHA-256: a8f4f6eff763286eb478a6fb4ca5d40548a4bb1c011c5ddf70f570bd7d216b3b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. These URLs are likely intended to lure users into clicking them, potentially leading to phishing pages or further malware downloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/a19c7c49f754ed5055e844c40d28950a/78423086884.pdf In PDF document text
    • https://albawadiroad.com/userfiles/files/xuwojamagomemeba.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609afb48c4769---jegawe.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/tipamonop.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/59897081213.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/raxavadefasud.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/80299041407.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/377c142a0d749b9fc7820f5f5a213564/jivetemalizoxijovomajin.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/59568022376.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/3ecd53290cf5a6fc40d0177af902a3fe/75071080028.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/visamumizudatigakiwok.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/66a27a7e7232d966a5dc9347e97aaf92/nebejozaxuwibefixow.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/886264869.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/67743716063.pdfIn PDF document text
    • http://wallsfamily1912.com/clients/876683/File/46546932757.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/705b69a66a029866614512688a4652f6/87884420144.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/27320378363.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/relezabew.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/62602877601.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/leligetubolomesepizifav.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d3e36214b---39534721937.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/53617f7905ae5404689b2c1df48edabc/zasag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=sustainable+development+united+nations+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_off0000b6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B7 15324 bytes
SHA-256: fda3b43fc62f90d82a5eb7016c781afdfdaae982b659070942edb748c1acae11
font_01_sfnt_off0000dd77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58E 10940 bytes
SHA-256: 4dc9b0054327b82d4050779393d5a10f480f99732ec8543974b68a3577d00e07

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