Malicious PDF — malware analysis report

Static analysis result for SHA-256 d21542e3f84be104…

MALICIOUS

PDF

80.0 KB Created: 2021-09-19 07:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 19b524103f28d1510786478feb9ef486 SHA-1: a3fba6d08716bf38bb779cf662f242b6963eaaa6 SHA-256: d21542e3f84be1049f423f36688ad0fb0d45d0edbcb9f68c249be5014300c004
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 detecting it as Pdf.Phishing.Trojan. The numerous embedded URLs and link farm structure indicate an attempt to redirect users to compromised websites, likely for phishing or malware distribution. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=watch+soccer+live+free PDF link annotation
    • https://pmsp-me.com/userfiles/files/53487329794.pdfIn PDF document text
    • http://vhshf.de/File/guxuvab.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143f3ae93216---tobumosemaso.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/75e19fd1b682e5246ffe91f339c48d24/sunajutawuwiwopibewamex.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/bekuduku.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/1pbdvtd0mqfctc5q7e852c33n0/37482234280.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/11287090231.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/rabebibumiwoduli.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/58810188107.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/jifajitajosug.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210902_E01111F829ABF608.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/934639aaf6a58c468d2d4af9f3ecc583/lixigeziga.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/b3628a3bb815094bc0ba88417cdb1c48/wojinefinud.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613515aa53792---wanofirukimononataxesad.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/reniremuwojene.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/rapijozuwopa.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/94535275215.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/gikonikodujufuvuxej.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/37225230439.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/83698710635.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/vigaregipenupeluno.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/zorutufadem.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/latisebaxumaxurugi.pdfIn PDF document text
    • https://edusfera.pl/upload/file/lezetex.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/kisibagu.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_off0000d49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB2 10388 bytes
SHA-256: 30fce2a1a3a56df020209ae296e9bee153e4a43d596bbd7f87b51813c095f39b
font_02_sfnt_off00010466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10466 17680 bytes
SHA-256: 86e3815762126196924dcd51c26893bf2efbc2aeb00517a42924d124ff5de749

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