Malicious PDF — malware analysis report

Static analysis result for SHA-256 22d3ea94f72e7b91…

MALICIOUS

PDF

80.3 KB Created: 2021-09-13 05:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2d6f9bc1147dc25761d009d38db2309d SHA-1: ec6bf20f95f832ff66d138091bfb9c20d0d1705b SHA-256: 22d3ea94f72e7b910bf3493296825839e3d435cbf5ff6eeb0b36e0be5137384d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress uploads and other disposable hosting. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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 https://drafthe.ru/uplcv?utm_term=idbs+truck+trailer+mod+apk PDF link annotation
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/2e4050979ebda51f34e5a44103f16f0e/8575470290.pdfIn PDF document text
    • http://ipublicity.cz/data/file/kebodegigogimujada.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/72500082791.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/73127102154.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/21772951407.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/defokijem.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/tuvegefabanuvalunojimol.pdfIn PDF document text
    • http://soncongnghiepjotun.com/media/ftp/file/20195407745.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134d7dd1da1d---81540187941.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/24662419156.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/dubefisugukurokuw.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/sumofevisisizeremedaro.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/bedapifitinalub.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/pokusutiseko.pdfIn PDF document text
    • https://hometutorsdelhi.com/userfiles/files/95412842012.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/nenabukemomelorilodis.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/fapewaze.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/40722178162.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/30280891172.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/17162900247.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/dobawu.pdfIn PDF document text
    • https://bio86.net/userfiles/fichiers/10918276558.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/f03fa338d4d2e0abe857995e07109e3f/kexuwubuxazeragenele.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/jemawirawatilerof.pdfIn PDF document text
    • 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_off0000d4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D3 10856 bytes
SHA-256: 0ea60aa64e7807c1e2b1d2b8f29170ec71719e1b79daf2e647409a0768482df4
font_01_sfnt_off0000edb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C5 17632 bytes
SHA-256: 2a88857c87501baff0b5680c84805b4b1413e2058eac077d8b03e66e3e2e0857