Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a0a1084880ede9c…

MALICIOUS

PDF

87.7 KB Created: 2021-06-25 23:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 39c8bbe63caa4613b31d76631557325c SHA-1: 6daf843dfd9f93ca2cdadb59c5ba72eb2e6f1822 SHA-256: 6a0a1084880ede9c4f0482a7bc13cf8f210376b57c1cf52ad63478bcb3c30c12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These links likely serve as a distribution mechanism for phishing or malware, leveraging the compromised infrastructure to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://arnetbilgisayar.com/upload/ckfinder/files/jogefegofofu.pdf
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/t6qhkk8dffofakfaarvq2husl0/sunuxi.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d52463932---39077676665.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607412b0f335f---bafuk.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160747df4bdaf2---jitubilip.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/511ffe7477139f822836333e71520437/wukadarisapikewimese.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6beaba320---60257875506.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/7ao86k6rj1dm2lm351cuoq55ng/zakawe.pdf
    • https://bloomland.com/sites/bloomland.com/files/22090923599.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076cc5453689---94895170470.pdf
    • https://walnutcreekguide.com/wysiwygfiles/file/sutesipesetirag.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d1fbfacd2f7---86894592192.pdf
    • http://zgkimsteszew.pl/img/upload/files/mozusadenigegoxok.pdf
    • http://ldbell1965.net/clients/85689/File/27175819282.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/5680087a3534d693589187d5f071ad9a/93988097717.pdf
    • http://hitecds.com/userfiles/file/ronafozuruji.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/q1u3gkfeg48fc1u6mopdsojnka/zibematuka.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd5442c303---mivosi.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d175729af0---71159371761.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/brt1rfk1br6gk964h1rnlecdfn/bulizetelatofikaxajorosa.pdf
    • http://conblocmanado.com/pics/file/nikumi.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/to1fire5od6qgkt0gs894frr4i/92364473247.pdf
    • http://m2m2design.com/userfiles/jinusoboruxeloroxosikutax.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/a049b628b6f5257cce5f5c4acdca98c5/firujis.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=lirik+lagu+i+keep+waiting+for+you+but+you+never+come
    • 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_off0000f188.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF188 16792 bytes
font_01_sfnt_off0001099a.bin
30ad3de91bc6fc7167cbb9e4fb015d5e63972f18b7d61df33b5f5deeca193d64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1099A 17516 bytes
font_02_sfnt_off0001372d.bin
288cf2b495c70cd3e9bbe9f4b00418f56303e3c6e418ae4f6eb1ac8d1c1569a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1372D 11212 bytes

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