Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9ac1481ebaf0359…

MALICIOUS

PDF

183.5 KB Created: 2021-09-04 18:32:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e222a1073431fc49aa171e66a499cba3 SHA-1: b5824d1bfe5d0025949f21a7412f1cc67fb7c1ba SHA-256: b9ac1481ebaf035956276a1d1f1e670a1e9a864098090f2b0bd300b3ee316a8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://laborke.ru/uplcv?utm_term=vax+carpet+washer+instruction+manual PDF link annotation
    • http://fujiya-la.com/uploads/files/vukokekudabutaxevil.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/33771588805.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/mazewimojakefuv.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/386f386738f0656b92f3d3e25fcab0aa/mesixebepezer.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/2gk5tj330golo4g8mcfqimibf2/66005342942.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/renirutekafudufoxuwino.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/mubodikaxejije.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/db29307ffaa91d0b6d45f645848542b3/nijewav.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/8db7d47b541f69fbfd0ffead8e34fd56/98949705410.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/5395581760.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161233cfadfc64.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/nununimazo.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/85062767337.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/445f0347aebf508c40f59c1461ffc39a/konelifeputematibajodaz.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/zevaturekesuduvebutaxes.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/37530519005.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/a4e9493633a14a8b1e6491810c5d7231/wujiregazaj.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/molejipidukuzifev.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161206360533a2---bonitunofadarekij.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/13e8a39b9cca08a93147760dd1bf6947/mosogupexedoni.pdfIn PDF document text
    • http://flexicourse.cz/res/file/pikibazeg.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/munazuwuxisaderonexaz.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf0f7067eb---56208537752.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/c369f8b62d81d9739304e2e4c3c9f361/wofozesorawamibabizoseviw.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_off00027072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27072 10896 bytes
SHA-256: b4613afd318c60a8f1de8b2b5634424f7df3ce344d7e71179affa09213c56815
font_01_sfnt_off00028987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28987 17800 bytes
SHA-256: 0eab9f1a1d4996b1fc76eea3e4617684532abf059ad1db31d15959c3518f54cf
font_02_sfnt_off0002b7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B7B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1