Malicious PDF — malware analysis report

Static analysis result for SHA-256 6db5c40c63592d2c…

MALICIOUS

PDF

95.0 KB Created: 2021-08-24 23:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fdf210de82224563b7369bc4df3e437c SHA-1: 9206f779ba7643379e1bd6529ac764643588b3ec SHA-256: 6db5c40c63592d2cb2d0d3a83e9cb40df0fad3cfb2f78d33cc3d942eced305b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress installations, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the link farm suggests it's intended to lead users to malicious sites, potentially leveraging embedded JavaScript or other exploits within the linked content.

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 http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160c70a749f8af---xegabora.pdf In PDF document text
    • http://adveotec.com/img/file/50447090857.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/dd944fe9775c83f890bb121481a2ed74/moterugizewezix.pdfIn PDF document text
    • https://beaszemin.com/files/84303297247.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/jabim.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/60664353609.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fda136c321c---30210369973.pdfIn PDF document text
    • http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/5681331554.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/noxafururogedanisuzazoj.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607573dd58aee---linojagetopegolijesanu.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/minodewujenesu.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/35446cfe073cc19b60fe5fa2d4c38dfc/51669922273.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/47a66b3c7b6126c210520eca75d997e0/xorurilisugatilamevuk.pdfIn PDF document text
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/mibemovaligujisikomu.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/3616317388.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/43948418142.pdfIn PDF document text
    • http://foxadv.net/file/zuzejusune.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/pomizewebowix.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb3be2bd9a---wabebux.pdfIn PDF document text
    • http://metallpress.ru/files/45472021425.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/taveposekogakifuzu.pdfIn PDF document text
    • http://minerva-collection.net/files/files/95995489893.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/45767345897.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/36lhvlb00o69ov9gbpt48ealq4/82872595221.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+long+is+a+soccer+game+on+tvPDF 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_off00010e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12667 17596 bytes
SHA-256: 5d349481ea69b08c5e3c83e2a6a901c1905ff01ef879b6cdec253f34cc07a5f6
font_02_sfnt_off00015471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15471 10716 bytes
SHA-256: d1b0cf0637fefba4ec02867c89f1b590f2043f1384c34b5eb8c4d2f34dfe18df

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