Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e4219933fb7e989…

MALICIOUS

PDF

76.1 KB Created: 2021-08-22 07:44:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3795a7285328e81711b3746405ea334c SHA-1: 0de2fabda271726b6ccc5003baf9fcea36f3d90b SHA-256: 5e4219933fb7e989806b190f9b8e9fa758f4905e7aac99270655d1c4072cd6f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, likely to facilitate phishing attacks or distribute further malware. The PDF structure and embedded links suggest it's designed to lure users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://archism.ru/uplcv?utm_term=anatomy+and+physiology+lab+exam+2+quizlet PDF link annotation
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/gljosbm7h6nk7qgf2bdj20pt71/goparetuwov.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/233fe47b5e1e06bb7d2996c0639dcc4c/12063921490.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/31762355884.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16112413d82181---18496305465.pdfIn PDF document text
    • http://artepcb.com/upload/files/13832796682.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e54e469f77e---82798569527.pdfIn PDF document text
    • http://besteva.com/upload/files/36934612829.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/bubavinolegeguzogomogepof.pdfIn PDF document text
    • https://thinkhigh-tech.com/d/files/wadetewefiki.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/83799122349.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/jigarajivivazegewab.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210703_E751E0644A13909D.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/9402252c4081bd82057fc2ac91aff030/sofiputawamozafepet.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210619_DCED70C878C6FFD5.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/pemozi.pdfIn PDF document text
    • http://amandamaitland.com/images/file/36803884009.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c18e66cfa6---19853546095.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104cf858e0cb---naratiwesizojekirivelu.pdfIn PDF document text
    • http://blissworldbeauty.com/newerac2c/userfiles/file/zakatilipibidira.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/93836037148.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/47435811817.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ee53195ff---dunixudaku.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1610c93fc5f90b---23833056293.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29a1d76755---rutulomoginulimis.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_off0000c564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC564 16168 bytes
SHA-256: 584d4516e76449b316121be26b6a85d957425e04ef3a56390a2d60454de8b4d7
font_01_sfnt_off0000eefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10713 11500 bytes
SHA-256: 8cc72928a03bd5e1eb9e2fc0cd561dc6c5939ce4615bedf48777276a41ad9fbb

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