Malicious PDF — malware analysis report

Static analysis result for SHA-256 287dea350b2d66b7…

MALICIOUS

PDF

73.9 KB Created: 2021-09-04 00:02:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a3d8c9f330229288b863a5177198d9b1 SHA-1: d63e1bf9de7ab4993b6ffcb99ed5660a0c35c821 SHA-256: 287dea350b2d66b7a22e07f8b2247bb9dff469766388ee17b499136695383613
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various websites, many of which are identified as link farms on potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the heuristic findings clearly point to a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb01e33f40---40514286905.pdf In PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/ba06590df9110b5457d3cfc2a80a7334/28112435679.pdfIn PDF document text
    • https://clove7.com/userfiles/file/57214135691.pdfIn PDF document text
    • http://christopherdallo.com/file/zisolowe.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/xafasubinagufewajugekabar.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/36346059371.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/ruburutorasoboj.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/161012893b3e2d---91084223717.pdfIn PDF document text
    • http://maduraigarlandshop.com/userfiles/file/91068258712.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/gelivozi.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/97524729908.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/20784713769.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d9a441f8b---99486248063.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/mosoxobafuwijuxezusiv.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/41671039973.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f00ba67fee3---62611791627.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/40d2d73b9614e9c93ea29c3cbe61a36c/90546814028.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/dizupodofanudatosa.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/f8c9dc0379739137335751ee368ce1a4/sosokorupegepikurezi.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/81412740578.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/161299994cfb12---28302556192.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/guzidakinebepavuwiworal.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/vibezipigima.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d6e34ed04---50051262147.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/bip7j87esm3ojev3n7e33t1c9t/rasudazajixalobefodo.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/61050358058.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=can+could+may+might+should+exercises+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bdf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60B 16228 bytes
SHA-256: a74a577374fa5cd3234401616bf100fa9fb1c732c28795372954ab8f34dbbb29
font_02_sfnt_off0000ff96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF96 11416 bytes
SHA-256: 107493199af2d9d3ae5a9b3cb126a1a8f7dad59410bcb589f553ef52706b9f6c

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