Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b5bcaab2c79b706…

MALICIOUS

PDF

102.5 KB Created: 2021-06-23 16:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 5ac9578bff3f4d90ee6f6bba9a5a5e49 SHA-1: 691fc5e21abee619707ed787ee369bed9d9bc320 SHA-256: 5b5bcaab2c79b706d5a9d5ee3e6ffbaed769572549ae7bfd077c5ae7490c626f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous external URIs and links to compromised WordPress sites, suggesting it is part of a phishing campaign or used to distribute further malware. The document body is heavily obfuscated and unreadable, but the presence of embedded URLs and the nature of the heuristics strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://crewmak.ru/uplcv?utm_term=breviarium+monasticum+pdf PDF link annotation
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/b043b8184fd7a06bd07b40fab644e29e/75869930179.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d1afaa989---nitepupon.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cef199acd3---17355422692.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/990fd3e5e79b9d280691ea7d63aac554/misepuxiv.pdfIn PDF document text
    • http://santeh.md/img/files/kowipez.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/51018047505.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/76307326739.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0638186001619839716.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607764084d44d---90195701447.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/lijajofolor.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607e866379060---40813448104.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985bf1b2293---leseg.pdfIn PDF document text
    • https://area5srl.it/file/fivepu.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/kukekokigoxonazenulewu.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/polozazadaluvekutugibonan.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874a87c80d4---42110861993.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000126a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A2 5260 bytes
SHA-256: 2d66d6fe093654772d4c416117b1d6a5bd24569b4d85db0b120cffad127a56f9
font_01_sfnt_off0001386d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1386D 15516 bytes
SHA-256: d20eb6cfc0ed06fa33d2de59d3eeff0d2b754ef8d4b68aa8ee53bd4fdb8c94a4
font_02_sfnt_off000166e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166E5 16228 bytes
SHA-256: 75364f65dacbb08f2062a8495a07dc06622f7cafdb83ffbc2223e8c67a15929c
font_03_sfnt_off00017c42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C42 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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