Malicious PDF — malware analysis report

Static analysis result for SHA-256 adf9f91dd2592436…

MALICIOUS

PDF

83.5 KB Created: 2021-09-17 23:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4587b2b54dd5b020fbc879ab5d8d1abc SHA-1: e2c0d79c1f90d944a7760238e207adfa833ac814 SHA-256: adf9f91dd2592436a87afb82af661e90e4fdf03c500fcb5052367671de58acf9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many of which are hosted on disposable domains or compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://irlanc.ru/uplcv?utm_term=teleport+photo+editor PDF link annotation
    • http://managhantasala.net/mailuserfiles/file/bonufadixagavoletigese.pdfIn PDF document text
    • http://4bx.pl/public/file/91631437620.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/xusimeje.pdfIn PDF document text
    • http://airzo.net/userData/board/file/jixofuwebejuwesa.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/30553157794.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140218f7bee3---44801508952.pdfIn PDF document text
    • http://ciba.lv/uploaded/file/vipomexufuxizurefumav.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/9332eb8eea1375c3e46b9356cac0895c/bosafum.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/56509041934.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/89915126342.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/0b36f22f99c5fd57246a3e61ca99fbba/bisuwimivaworok.pdfIn PDF document text
    • https://magatek.com/documents/file/56312827565.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/38409320829.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/zelileterexodafek.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/jodutasolomibepopaw.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/bizadarudumevurus.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/75684773734.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1613282602c8e5---47081519829.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/35399998582.pdfIn PDF document text
    • http://atrsara.ir/resource/files/nufupepemojokasuwez.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/47427995569.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/kulaxivinon.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_off0000e283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE283 10020 bytes
SHA-256: ee290710a19562da47f375d9f89d5153678a93f2fd63b065a89fb5790330a6ba
font_01_sfnt_off0000f8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CE 18184 bytes
SHA-256: a53b9dd8c322ec4fa8f2a68ddf6f3c7522678a3fe8fd6bc6dd54bbf2e3440413
font_02_sfnt_off00012832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12832 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1