Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1c4a8b401107532…

MALICIOUS

PDF

71.9 KB Created: 2021-09-01 19:28:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: caa52cf058a7976c66f55a7406f56249 SHA-1: 499dac16bff79fd7e3f1a3c8527768004b889041 SHA-256: b1c4a8b4011075321df21a5fe1c6441d5d419aa40d7037a1640265815ae629bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the structure suggests it's designed to lure users into clicking through a chain of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://jambumanis.com/contents//files/vipoli.pdf In PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/80440004826.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/86825292914.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/7f8f710fa07165b2b6642fad2dffe58a/gikapugez.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/sinozanesolovuzugerovujup.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/001pirg0v6vcu88ncpi19k2ha0/kixikujafefu.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/7309038302.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/95673933431.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/44639022750.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf97e513f2---85499945529.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/92902308379.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/masawaboradazisusunere.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/40451662928.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/9dba9645c6bd558ea81a4ae872d6aab4/rekidudesan.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/42033303868.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/fenijolerufogama.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0238c1105f---tametozigi.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abdcee2422e---ruturegir.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/1e57971404330f3d4cb9c89d3d253570/3583439868.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/h7uv2e80ahhkef4bfhp57frv98/vesizok.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/l9ek7lbaohkodcsffgmbpvbk05/30733194927.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=hairball+cat+throw+upPDF 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_off0000bb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB9D 15516 bytes
SHA-256: 029be257b34a171d8bc03a54b8b7f1fe67a45f68528035146115eab0b2ce5e14
font_01_sfnt_off0000e2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D7 10384 bytes
SHA-256: 9d8579c0a156fcc8046ef6397732187573db9ed7981bd097bce582b7d4d98a17
font_02_sfnt_off0000fa3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1