Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5996014c9354b7c…

MALICIOUS

PDF

69.0 KB Created: 2021-09-26 19:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: afd6e30fd484742ac9069339fc2c7760 SHA-1: a70f5da35cec00677b86e40f81dcd6502ec13125 SHA-256: d5996014c9354b7c8a9f6e932d03c32eab6db89dc797df7c45160490c17299fc
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple PDF link farm heuristics further supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://fli.edu.mn/ckfinder/userfiles/files/83208548926.pdf
    • http://tcsklife.com/filespath/files/20210903122725.pdf
    • https://habibitours.org/ckfinder/userfiles/files/jekufavalu.pdf
    • https://manenshop.com/upload/files/16580289482.pdf
    • https://granitabrasive.com/editor_up/tegavigewuramujox.pdf
    • https://hearing-outlet.com/uploads/files/202109150226546126.pdf
    • http://redactron.com/userfiles/file/25547915024.pdf
    • https://ratsimae.ee/media/contents/file/76787312190.pdf
    • http://cableesmaltado.com/d/files/48840229812.pdf
    • http://www.psoealora.es/ckfinder/userfiles/files/85396602301.pdf
    • http://splhardware.com/UploadFile/file/2021090817040273499.pdf
    • http://bjerkelunden.org/content/files/userfiles/file///palufox.pdf
    • https://99shayari.in/userfiles/files/31222500479.pdf
    • http://oilspecchem.com/files/donetorimarepovupimo.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16138e4da2e141---vowamitovev.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/vm8btlcb6i35doo39m9vln4rt3/bemexuwomoduzatobiwoju.pdf
    • https://locktactyuma.com/userfiles/file/nozal.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ba7a8ba98---worabopada.pdf
    • http://av-jet.ru/userfiles/file/fodejowutegojosof.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/15ga7us0075udob31ut3fhnuj1/85937595687.pdf
    • http://esistore.be/userfiles/file/wokokosikunapimuz.pdf
    • http://hglobaltour.com/FileData/ckfinder/files/20210922_582EEDB7CB76332B.pdf
    • https://www.aaptuk.org/ckfinder/userfiles/files/difizosem.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=harry+potter+gba+download
    • 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_off0000b175.bin
88f5ee57923bfe9807851ba727d282ea24e9ee0df5aa9158cac07c42e18697b3
pdf-font-stream PDF embedded font (sfnt) at offset 0xB175 10640 bytes
font_01_sfnt_off0000c986.bin
6daafd4c7e9a9a2432f1ba2dcf9eaee2bc403f28a1e151ab1d1ae42fdbabeaa9
pdf-font-stream PDF embedded font (sfnt) at offset 0xC986 14628 bytes
font_02_sfnt_off0000ee46.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE46 16792 bytes