Malicious PDF — malware analysis report

Static analysis result for SHA-256 a47ac31aba5a86aa…

MALICIOUS

PDF

102.6 KB Created: 2021-07-01 14:26:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: dd26bfa6d6fb122b9736eba6ce4fd796 SHA-1: 636aff74a56c9a30545851423807a05444718170 SHA-256: a47ac31aba5a86aa591883969fd9cc1477d973a318dbcdd2c9be7ccd88f33ab4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file functions as a link farm, directing users to multiple compromised websites. These sites, in turn, host other PDF files, indicating a multi-stage distribution or phishing campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://ludifrance.fr/userfiles/file/12066617768.pdf In PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160a84a345079e---60933665.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cac714a931---pujijojipo.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/e595672450f816f6d83fe72a34604b48/zevanuzaxemumenolu.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/81727e8ad96aeffbc2e244c2098c73f6/6875824821.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/pugetabokilanikosafupot.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/47695640260cab939083e2.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/aa5giqtbjpunel7ed6m6eqjrp0/90435178633.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16076bbb08168f---2090035587.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/gewatilon.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/46c37c110b3ffa6429caad5d5a7d9d1f/ximun.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/9129572646.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/93379346142.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/a289a6b18119da37be1011cc7349effb/jumijabalisiguwi.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/rinosa.pdfIn PDF document text
    • http://wami.cc/data/files/70949873655.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/a469e3945f4593ba71d24cab196586fa/panepawovi.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/dazusaneso.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16079de4ae057f---456110743.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/tibijofikabazen.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/dizevipulure.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/24464806029.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8fca95c48---31927382601.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/332vf0sjkcneaso2ir3f046a52/ratebofuno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=the+death+of+peter+parkerPDF 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_off00012f19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14730 10240 bytes
SHA-256: d1b7b004c1b5d8f44ef127f243b30dd5d6a1ffabc8e2deda645a81389abfa270
font_02_sfnt_off00015e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E55 17828 bytes
SHA-256: a7c3fa6a86b34c8360e7d5473d222b708d86046e99b6e2f5d9e317bdec31ec7f