Malicious PDF — malware analysis report

Static analysis result for SHA-256 d371d86219c4c221…

MALICIOUS

PDF

89.7 KB Created: 2021-07-27 01:33:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ebf1b5faee0090e7419125dd8db67cde SHA-1: baff5122782ca8cd3d100f4b725976129564b792 SHA-256: d371d86219c4c2216b7425a2f839d36e7c7593cbf2f38d9fbe248e3c4dcb8dcd
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://artinterior.bg/userfiles/file/peseduletitateg.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/8096981783.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c716d5f6fd---17441977202.pdf
    • http://actlogistic.vn/upload/editor/files/85633590350.pdf
    • http://dental-forum.ru/userfiles/file/80935635091.pdf
    • https://ferado.vn/userfiles/file/lenabuwujizaginafu.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/4285542207.pdf
    • http://romangruszecki.com/uploaded/file/sizupalovofewapezisaja.pdf
    • https://fizjolech.pl/userfiles/file/51600152813.pdf
    • https://kme.pl/global/app/webroot/uploads/file/16236859776169.pdf
    • http://aggengr.com/uploads/CMS/file/terajado.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f0387cada0a---linolirukemajowo.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0b2237ea4---90909832671.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00b830fc4e---26752852646.pdf
    • http://fenotropil.ru/userfiles/file/miderefafimuxeb.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/5557569a22ae9b1165373b3c35624d7a/fulemaso.pdf
    • http://dzbnf.com/upload/file///88834489907.pdf
    • http://maslag.eu/userfiles/file/84082633690.pdf
    • http://gibson100.com/clients/870224/File/47728698017.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5511057a5---kejetixufapidumoxo.pdf
    • https://topclassgreenery.nl/images/file/pawofubexuwixalitejokaxeb.pdf
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/86001732168.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7f4369a91---tifawevu.pdf
    • https://ski-experience-japan.com/images/blog//file/junifevopomenaraxomirofi.pdf
    • https://journeywithmypet.com/ckfinder/userfiles/files/57728133003.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=farm+animal+adopt+me
    • 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_off0000fe40.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE40 16792 bytes
font_01_sfnt_off00011652.bin
2c0bf7a1d055cfabfb72bbab56390e9b505a7ed67463c3061db9a9b84da3b757
pdf-font-stream PDF embedded font (sfnt) at offset 0x11652 16860 bytes
font_02_sfnt_off00014200.bin
173ee625cbafc825f70868b1a0ce28663b77a669a3f020a40e203e84311ea096
pdf-font-stream PDF embedded font (sfnt) at offset 0x14200 10364 bytes