Malicious PDF — malware analysis report

Static analysis result for SHA-256 9672ff26f2f22d6b…

MALICIOUS

PDF

91.4 KB Created: 2021-06-19 00:38:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4407f7332cf2c023da6b722cd1f93dec SHA-1: 520b3482d78f1faa6d5ebe919e397674da63bcbc SHA-256: 9672ff26f2f22d6b93e8e2565ef6f3cd542e21dd2f94f57ea1e4280bf9b45423
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content or phishing pages. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and 'Qt', indicating its generation method rather than user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://huntic.ru/uplcv?utm_term=maplestory+hayato+5th+job PDF link annotation
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/dqik9bbu849llgtm0l0m8of16h/69611016848.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/7860549a2c554b81b4616820d675e135/46011017088.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a30d4625456---99241142115.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608872ca1ed09---wukiforepiwajositepitovi.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b061b26ab---61548870832.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aafd62b35de---kozopej.pdfIn PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/59828071677.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/9d2bfb472f8d536c0479b7509e5f3c3d/79353501550.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a5b8b6b3a---rokusudegetenofas.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/29643725652.pdfIn PDF document text
    • http://dges.in/userfiles/file/53768907422.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160742e446c4a8---55959657090.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/7914275117.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/8b656bd0d8d2504918b1df93c40dec21/buwajar.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b7eeada2c---nodusurevujilavubifizex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000104b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B0 3620 bytes
SHA-256: bb30fefa5b945df4b4d669052dfaecdca89f7e8e03a6ce8f7586141516a21f29
font_01_sfnt_off00011195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11195 5356 bytes
SHA-256: c51920ba14940dadf7006fd3ef88e5ef72e5148b9c791340375050c65b8c8601
font_02_sfnt_off000123dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DC 10988 bytes
SHA-256: 64e73c89c0b8ddde70b6f3466e9b6714fb4e9e31159552adb200d385beb8769b
font_03_sfnt_off00014975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14975 16196 bytes
SHA-256: 536551dee6876366cf8a5d925709f0aaa9c9f58e9963f4e154d0e8cf77de6ee3

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