Malicious PDF — malware analysis report

Static analysis result for SHA-256 991f0bf3f840fe08…

MALICIOUS

PDF

61.0 KB Created: 2021-06-26 09:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8dfbd15913e81888895fb6ca41ced3f2 SHA-1: aa4f4af9a7def21499dd7de42d3f52c62fdb270b SHA-256: 991f0bf3f840fe08fafa90bc3a91d74cca961fa30e8c72e2139456eb82247e76
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised CMS uploads and disposable hosting sites. Although no scripts were explicitly extracted, the PDF structure and link farm behavior suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8187

Heuristics 5

  • 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
  • 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://burstallconrad.com/editor_files/file/30003598572.pdf In PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/vifavuzisenemaluri.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f08f50255---ragimolopawazuvuvavizoxew.pdfIn PDF document text
    • https://plasy.com/uploads/file/nijaziderujarow.pdfIn PDF document text
    • http://mrsinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/88952904249.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b7c822022---29369814288.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/tidakomojenuxavuwovakavo.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/rujaku.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/nolazemetoxiboni.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/gufewowumipemeriwuk.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/67449870491.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/890686a21da773b7e81fecaa44d5c382/silawarugijokegetedijose.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/15r7e62tf43158pa1iibfmdocb/16654317665.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b10a8c93b2b---ruzivon.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/7di29m5n7tmul6rq3d383qb9u7/9547589871.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/32428753376.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823a4227316---fanox.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c27967a1b08---7069225091.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/renijogu.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/jomusemiwopi.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/kulunaxozuwepenijibup.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/2748d6184097530bb71d8546861b788c/51760681978.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d0bd6936a1ee1a814ad6fea8d95fd474/83672565846.pdfIn PDF document text
    • http://innotack.com/userfiles/files/48570645460.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/360b65bd35919080127125d398c3bf9c/65375742507.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=springs+at+woodlands+southPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1