Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbd1db419c5d12e7…

MALICIOUS

PDF

74.4 KB Created: 2021-09-28 08:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 74053106e278fe739c78ec65f13e349d SHA-1: 9cabfeb6b791d41e6274b5ca79d10fe67f220ba8 SHA-256: dbd1db419c5d12e793d84467375fd56b426ec566aab4eb5fdc437ec4027a590d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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=pueblo+en+vilo+pdf PDF link annotation
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/6ua4fvcug6crtojt4jhgoc8icm/70984216033.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/vatemajabuv.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/sosirizugek.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/43774492638.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/98210268117.pdfIn PDF document text
    • http://rld-carbon.com/file/35575209877.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16327360986008.pdfIn PDF document text
    • http://huefpdf.org/upload/file/dobibipebemamojabidasura.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/musavagikolenasozo.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/17448441154.pdfIn PDF document text
    • http://philboyd.com/61941853799.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/2021925555392488.pdfIn PDF document text
    • https://clinicscrm.com/img/files/rosopirox.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/c1588d4b0c9c72fbd071244a82388169/kigerosirupimodin.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/42448047296.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/44192212880.pdfIn PDF document text
    • http://stroi-sistema.ru/img/42255236986.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/61078086540.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/rofigula.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/2e1f002e23d13528d354bcbefaece658/83702908157.pdfIn PDF document text
    • http://glttek.com/userfiles/file/14016693095.pdfIn PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/devapakesu.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/17936172035.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_off0000bc21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC21 10272 bytes
SHA-256: 2afc037b6629d391156f4644b442109e758bf7a673a0c8551039790380ccca82
font_01_sfnt_off0000d30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30E 18448 bytes
SHA-256: 4ca85cddda9c6b5c8576c19b856b91bb05b291caf545e82c7534ab5917d3540f
font_02_sfnt_off00010256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10256 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1