Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbfc9f65326cc9db…

MALICIOUS

PDF

87.5 KB Created: 2021-08-05 18:08:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7ea082817481fa5ce0b7bad8f60b24b7 SHA-1: c7b0ac420933e87b9747119838463c5e9aa60740 SHA-256: fbfc9f65326cc9dba65c6eab9cd9f545a06974767afb050ec735a444aff91e02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/a566a94ff017ec0e62f27399d6aa1782/ragadawif.pdf In PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/70693341017.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/88424994272.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/xonegupezok.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/65409462866.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/54dce9fc1e12af292d314f68a2a7fc3b/96865089126.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2f2e65023---74750863076.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/af3e9dcabb915f6c6cfea8473a5c49cb/fuwaxojowugajurekibanudo.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/722e33add899cdb12041a61b4b38e321/gokowoziza.pdfIn PDF document text
    • http://poorclarescork.ie/images/33302930944.pdfIn PDF document text
    • http://cpviettin.com/upload/files/roguredotuvajij.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e2c4b18a4---tinisufabo.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/80687189106.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/92446045240.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/6ffc66d9cac65295d4823d5918eb5700/pozuwokanevefilijerubanu.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/b204c67360b01af4387a6751548d0a46/44758377947.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160fa1bf2c9efa---53694135813.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf459fde7e4---nebolibipijibuva.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/vuxikigakeb.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/jilad.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/badetona.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/peridekipivagak.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/37195095142.pdfIn PDF document text
    • https://geniodelweb.com/file/33101318492.pdfIn PDF document text
    • http://trevorhannant.com/polesokogalebomolaxexonik.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b37313f0fac---32044458611.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/mufavigipusamiva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=gibis+turma+da+m%C3%B4nica+ingl%C3%AAs+download+gr%C3%A1tis+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_off0000e90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90C 11680 bytes
SHA-256: 565411b7e3c8f95abb8c3ea9a1b6f4c885c58b8a75294fee178266f6d961b235
font_01_sfnt_off000103dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BEF 19604 bytes
SHA-256: 32b571c8338097869a91da2303ae345ffe9cd52291d1a2419b732f62d886bd05