Malicious PDF — malware analysis report

Static analysis result for SHA-256 eed3f7257fdb7581…

MALICIOUS

PDF

77.0 KB Created: 2021-09-20 17:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f20fa03a0cecdc770fc295187471c449 SHA-1: fc6fde229f2537891c7601ec6cb08cd3763d8890 SHA-256: eed3f7257fdb758147decaf0b3d53e0cb6db540d818708791a35804e240d0b2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://krisoc.ru/uplcv?utm_term=download+movies+and+series+app PDF link annotation
    • http://maslatalaia.com/userfiles/file/vipazomifavobademore.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/60898689209.pdfIn PDF document text
    • https://haidangpc.com/contents/files/foruzezisisaxevimu.pdfIn PDF document text
    • http://letsfinal.com/userfiles/file/96629661178.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/dizusefazunamatinebix.pdfIn PDF document text
    • http://weingut-suppan.at/files/kufolepuzeki.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/t15abiq6mkqkq2ie8q45orahob/limulugaripa.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/093ec0913a0b1574954357e55b8339c4/57979123776.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/magizorexosavegiti.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/bijizitigoj.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/12376591665.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d226f34d9---jerowopubimuwareneruma.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/43985770316.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/89621ca66db0507648b6ff33530fc648/jezuvuxotemidavejelo.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/soduzepemomaji.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/161436d041063f---wiroguworufajopekujo.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbfca9a0ea---lapawumukuwevozufutix.pdfIn PDF document text
    • https://techinnsrl.com/writable/public/userfiles/file/90518274458.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/99595619580.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/6681071178.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/3f4b65571141415f6d564bd0daca3073/57998777778.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_off0000c882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC882 17540 bytes
SHA-256: 638d8452d607ef2762fa9c3c8af7c71d52db46cf97f41fe131b39e2e200e2989
font_01_sfnt_off0000f636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF636 10608 bytes
SHA-256: 9937c7e5190a763b72aa967df8c2152559882347850282a171cc9549656674b9
font_02_sfnt_off00010e6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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