Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a9a37f234be45a9…

MALICIOUS

PDF

80.0 KB Created: 2021-09-16 09:23:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4ffee3a9d19685b8c2973f016bee4d4e SHA-1: c1369b91f7af4d5c55d70f646bba57d9d4ff12c0 SHA-256: 7a9a37f234be45a92e61710449c4ee40327b2ee58db48620498afbd80540649d
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to distribute malicious files. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection and ML classification confirm the malicious nature, likely as a phishing or malware distribution document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=original+vidmate+download PDF link annotation
    • http://boxethai38.com/upload/file/wonubofujararima.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/68781405940.pdfIn PDF document text
    • http://voijin.com/userfiles/files/bovemagej.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/c347eaeaf89d717a38aa816facd05f4d/paxawubela.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/98591120707.pdfIn PDF document text
    • http://roberlo.cz/www/files/file/sizafigukapelekenu.pdfIn PDF document text
    • http://edallyshop.com/upload/files/19042062490.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/julutakimo.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea3f464ae6---fovibenusuruxivika.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/56677320677.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/joxuguzowom.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae99db06b4---tobudepimenovikej.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/77301264729.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/161341e92aeca6---6952224257.pdfIn PDF document text
    • http://cold.lt/userfiles/file/82141934714.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/33005977988.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/dadatis.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/dolefesazefolagolo.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/5dc78bcbcf50ebcd242aa90b675a5c20/lofegiraxarezolerebo.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138de5c0ceb0---33132409673.pdfIn PDF document text
    • http://tfforming.ru/d/files/juwipozezef.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_off0000d542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD542 10600 bytes
SHA-256: 64860bfcdeb90fea7108b446c366d7ebc783a4d6616817551c47e802a104a95c
font_01_sfnt_off0000ed48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED48 17620 bytes
SHA-256: 0abdc64b4d71b058d91f3681181134d1953c4dcf71bf82f718ca587e1a526747
font_02_sfnt_off00011ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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