Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d377b7f9bca0b2a…

MALICIOUS

PDF

80.1 KB Created: 2021-07-13 21:36:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 32d652e9916e41e4ae7cd8bc14df3a2d SHA-1: 91718203f5b1823db2f34553e82443743370efa4 SHA-256: 1d377b7f9bca0b2a15f16e6fab273389e91363844fded7d2d1a14707303ad1f2
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting. The primary purpose appears to be directing users to external, potentially malicious content, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://tcihk.com/userfiles/88230852591.pdf
    • http://creativetechno.in/userfiles/file/gapumumimorefafobame.pdf
    • https://anukulagrotech.com/userfiles/file/71640746203.pdf
    • http://goldcoil.com/uploadfiles/files/22612485881.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/e2d34574f1512df5e724b2ddf0653ef3/zatajaj.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c61bed69551---33070302656.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/n2fhm58id3midv7tovncrso336/13993358561.pdf
    • http://lawrence-spruill.com/clients/42275/File/91686719991.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/603e79b7e0390593076510efff04b575/vagaxudoduxexuvomezu.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/7pnc2c4siveaa6cubidismff5j/15769105663.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b82e59e3a2c---55165991419.pdf
    • http://assushop.com/userfiles/assushop.com/file/77308265956.pdf
    • https://wrd13.com/force/file/tenisilun.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/7c4de404d4082a66acc1c9f40ecaf9f4/5853725153.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b01c1368308---70831422572.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f9ca63dfd---94110913902.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/dlm7dcg49ji8qbbmj6fk3ppbmp/fuxafi.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a781ababf95---79530115585.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc30889306---22977172629.pdf
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/f750925550dce279041a7c346f082c5d/66672211968.pdf
    • https://educhina.mn/editor/files/narizirabudebexiwukedenu.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/e2533bcc0ec3c98919f8a1cbc3d8c827/menusevu.pdf
    • http://ligneus.hu/upload/file/kajuwolupiva.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=chi+square+test+of+association+in+r
    • 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_off0000d584.bin
9ee0e3d4e7accf93186acf8b546d35dfda5708f6e533d9d42f7d2f0a8ff1c4fc
pdf-font-stream PDF embedded font (sfnt) at offset 0xD584 10664 bytes
font_01_sfnt_off0000edf7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF7 16792 bytes
font_02_sfnt_off00010609.bin
e255d35cc1d48e275dd01254990861959c77a646d467e6db049a9f3f2437ed58
pdf-font-stream PDF embedded font (sfnt) at offset 0x10609 17236 bytes