Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3adce2c1cbd9a61…

MALICIOUS

PDF

71.8 KB Created: 2021-09-02 19:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d2faaf0e575edd17b8fde6749ea406b7 SHA-1: 0b7878955ce05462137926788accf61818d5414d SHA-256: f3adce2c1cbd9a61e6c8bfa50708b8a3493df957b317739389975379b7ae9a27
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of numerous unknown URLs indicates a broad distribution or redirection strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.contal-farmer.com/uploads/files/gemudikoboxefinum.pdf In PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210724_1B5D211A626DA54E.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bc99f1eeb---31817630980.pdfIn PDF document text
    • http://janatalnajaf.com/basefile/janatalnajafcom/files/29634924544.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/17618191208.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/tazizopasowumukowiv.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7070d47d00---21891015014.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/22705990752.pdfIn PDF document text
    • https://bczenekar.hu/files/file/82335593448.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/57043934491.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/vapeludajajivutovaxi.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/33098851734.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210528105834130.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/hj5pt0rvsnved6505emk5jhsi9/59990688005.pdfIn PDF document text
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/63323392158.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/c563b7d6a575d9e2581275192c84da2c/zalowekibafaliv.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/samesalovipanegalifazofi.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/10311540469.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af86cdc706---sabatuzusumexus.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/66105777043.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/vurivi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=types+of+organisational+communication+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_off0000b7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF7 15888 bytes
SHA-256: e0ef7a1940eecb3e1b4fa5021469f1bd3f3a5cd23467f09407dbf833498bd7cf
font_02_sfnt_off0000f7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FE 11140 bytes
SHA-256: 5b59a2986e92ba78aac73431995b7a8759d31598987893e090233e665dbfe8d2

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