Malicious PDF — malware analysis report

Static analysis result for SHA-256 0151c1cf493320a8…

MALICIOUS

PDF

72.5 KB Created: 2021-09-26 23:37:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a386df1c19d1dbe569ebba19e15cd868 SHA-1: 9e59924482483032baddc15e5028dfdc9da6914d SHA-256: 0151c1cf493320a88b77b24c5d88711c1e55a56356ff54a6d109d06afd047c22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external content, consistent with phishing or malware distribution. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://synerhu.ru/uplcv?utm_term=build+a+bridge+mod+apk PDF link annotation
    • https://mvpartners.be/images/uploadedimages/file/makuzubopinegilox.pdfIn PDF document text
    • http://djpress.pl/Image/files/36997549461.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6db5e4581---73416442472.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/mukuwor.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/sofojavirizujatubigibodax.pdfIn PDF document text
    • http://bresky.cz/res/file/85012629693.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/sabarixalefos.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/8808557396.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210903_7CCF2C37700FB3D1.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1614154d9425c1---98847548665.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/20410378397.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/92852023386.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/68676408184.pdfIn PDF document text
    • https://loppisidjupdalen.se/images/uploaded/file/xedefesevum.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/64591529080.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/72652200477.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/7e7476369b98e8d088eac55f9a3e487e/33294991335.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/24457176862.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_off0000b61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB61C 10752 bytes
SHA-256: df2da5c4ca477fcb3145a2485cc430f8a80631f3cd7a5c745f700f242001b612
font_01_sfnt_off0000ce5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e66e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66E 18392 bytes
SHA-256: 34c0b58bd0f4adbf49d81728e1dfd0c59030b02bce37e376fa70286b338eb966

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