Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e5662ba64bf74f7…

MALICIOUS

PDF

79.8 KB Created: 2021-09-24 06:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f4be47027de717a401edf080a7535bff SHA-1: c4b05b0de4d1dc8c6d069b9e74af77b6a9b60426 SHA-256: 6e5662ba64bf74f77af1d8a3803b799504adc5b61cec9dff3376b4715aab271c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains a link farm with numerous URLs pointing to various domains, suggesting an attempt to redirect users to phishing or malware hosting sites. The presence of 'utm_term' parameters in some URLs indicates tracking or campaign-related activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://crewmak.ru/uplcv?utm_term=virtual+table+tennis+hack
    • http://telegid.tv/userfiles/files/53711989504.pdf
    • http://ivankotov.ru/img/lib/file/basubewemojigujeronuzele.pdf
    • https://slotsonline.ro/app/webroot/files/userfiles/files/76102250377.pdf
    • http://gianenricofabro.com/userfiles/files/73870763859.pdf
    • https://newsru.md/upload/userfiles/files/65715333161.pdf
    • https://inprovitcaribe.com/ckfinder/userfiles/files/puxelibapiniresodugogoge.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cf50683e4e---24351506189.pdf
    • http://bscartridge.com/pic/24562564705.pdf
    • http://koreanhotpot.com/uploads/files/lidisutosewij.pdf
    • http://www.vegagastro.pl/upload/file/jidibonenevuxododiba.pdf
    • https://sakura-bashi.com/uploads/files/202109201543381922.pdf
    • http://liccuza.ro/stiri_files/file/xisonegej.pdf
    • http://olech-rzeszow.pl/userfiles/file/71852823204.pdf
    • http://hy-sf.com/admin/upimg/file///4869624361.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/7i9ungan9623fc7nl4pfoca9l1/79812716092.pdf
    • https://saikekanglun.com/filespath/files/20210920221626.pdf
    • http://futureinfashion.com/ckfinder/userfiles/files/71009287382.pdf
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec589bcfb9---wevotaxiwani.pdf
    • http://zensushialiso.com/uploads/files/kisopatazivawatin.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c826.bin
78c3bfdd7eebce7e29036afeed977ab98cd8d3a4b8b4fdc5e5a91ecf052e97cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC826 22344 bytes
font_01_sfnt_off0001026f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1026F 16792 bytes
font_02_sfnt_off00011a86.bin
4f3550c0df34338a7db1f44a481436905c45a3a0eb61bb978264357de19ee86e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A86 10508 bytes

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