Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bd2d34d248ff0d4…

MALICIOUS

PDF

73.9 KB Created: 2021-08-21 00:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f30ad611cdbb3bfaff405a5c998047c8 SHA-1: 1fe1d62596cf8a256ab90fa2abb7f2621dafdefd SHA-256: 6bd2d34d248ff0d482687d4d8d38973c3918420bdaf036b47c59299c3d78d592
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the presence of external URIs and the PDF structure itself are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://allytemp.ru/uplcv?utm_term=modern+marvels+the+butcher+video+worksheet+answer+key+quizlet PDF link annotation
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160ad85c6cf979---2734328351.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/iughm71frdj887dp5qmicrec76/zomudikoxuvaraxowetinera.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/zegenidiwizenikaguvedike.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b23cd9e4d1f---6202135783.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/kolagezisalot.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/dibimenixase.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/14115382670.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f0a40b04b69---libiximaji.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/89324809717.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5173b7d0e4---72008616972.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b4da3ea93---36377763149.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/bfff83527372e25cbce4b861d5e8544a/xugisakawis.pdfIn PDF document text
    • https://ready4use.ru/uploads/files/weridewekesa.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/susawobitikositanesove.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/73805875113.pdfIn PDF document text
    • https://fid-data.fr/app/webroot/uploaderfiles/nimasof.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/27474023195.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/gadibutovetegubibupofenuz.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c75e249acb---xamanozosonuvogala.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092946c0dd51---27511952834.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/69340088831.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles//files/vawabowalevake.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_off0000bd31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD31 11432 bytes
SHA-256: 53d4789e52e6a3e28bc883c0342d468a450e60ce17b7531ecf3cf06282a9b65a
font_01_sfnt_off0000d7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF4 16348 bytes
SHA-256: 32127f25e86093231d4e7977fd2529788689e2050901e1cc5649d95ed4f1c506

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