Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb4aa5ea2dff9b12…

MALICIOUS

PDF

90.1 KB Created: 2021-07-13 23:36:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 4bd5db5608d237694bd581f7d77ce0b2 SHA-1: 2fdfdd4ffadcf9b536a0cf5e5e1c49d7d1d86b1d SHA-256: eb4aa5ea2dff9b12314fc1afc0ee16227aed35c519d83c1b72da040e38804970
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://smidgel.ru/uplcv?utm_term=order+of+reactivity+of+e1+and+e2 PDF link annotation
    • https://liantoong.com/archive/upload/files/48993757901.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/37570513925.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/nobopi.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/91681123057.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a28a16a743f---19669058052.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/81469536345.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080877b91c57---80441110740.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/31665260031.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/zebinagokoru.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d09d2840f---11940093832.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/zufov.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076d85fad47c---49170288789.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4e227e4c8---16993490111.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/22400165442.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160daa5e5bb278---63058875666.pdfIn PDF document text
    • https://xn--arbeitskndigungsrecht-best-5zc.de/userfiles/file/95922791840.pdfIn PDF document text
    • https://broodjedenbosch.nl/ckfinder/userfiles/files/wawakutagakeleroguwijof.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/xapamikevobalovi.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/b801da03a3e553cfa585c30f5b7f9888/nunovi.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/25831142874.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/16684329392.pdfIn PDF document text
    • http://alvitraders.com/files/32518783630.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/sozojadinok.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_off0000f6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AD 19496 bytes
SHA-256: f8aa632c948483fc1c38463ef321120504fee4d072c103c02e59b8d3b4ecea87
font_01_sfnt_off00012a3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3A 10632 bytes
SHA-256: 9f5b9c58376beffa6bb13a7cec6c3b706a679810fbcf38c87a63feaabdd26ccd
font_02_sfnt_off000142d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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