Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a10e374f489fb69…

MALICIOUS

PDF

70.9 KB Created: 2021-09-29 01:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ebfafcb92eb56c0032ab5178c4955306 SHA-1: dd3dd6876ffc63176a80b6ebe2b8f8bc57fec8e5 SHA-256: 5a10e374f489fb69198ba8b54e25cc3bc1eb0ccd61ff8d09e4ab6ab0e2be1495
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms this behavior, suggesting the document's primary purpose is to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://betenagro.com/sites/default/files/file/kipujazupovaloliju.pdf In PDF document text
    • http://kartinatv.org/uploads/files/zuxaputasegexuxoxivebolew.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/pasasuxijasekilotomewok.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/zifulizol.pdfIn PDF document text
    • http://wakabaeducation.com/userfiles/file/mexumitakobonake.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/vifudap.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/cb42a26c688cfa769098e8c38e3c971c/namilifogotimomimol.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/73779205550.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/94779295596.pdfIn PDF document text
    • https://akemi.ro/hirek/file/88486310605.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210925220226.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/39ba3bf3a723b7498cd91c344d188843/pukulavajuzapopesepixad.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/pekunote.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/9979359618.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/73331131523.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/69268935260.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/fekulemel.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210910071531107.pdfIn PDF document text
    • http://robvancampen.nl/userfiles/file/subotawidadevesawid.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f032fe3935---vitiroxuwatutimenozoni.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/suxutevamejexabolabo.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/b3e27ddd1987c65bc2219c817006dd70/wamajejujibuzolexazul.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/68935005810.pdfIn PDF document text
    • https://laps.pl/userfiles/file/vewipixufilepar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=super+sound+appPDF 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_off0000b1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D0 17612 bytes
SHA-256: 6a2039fd66e6945992c8be2759e3ba714a9fa853769147e9bb4d5f48e3910cb7
font_01_sfnt_off0000df60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF777 10324 bytes
SHA-256: e2dfa5dd674dafe51fb9d4e93f8e3990bd1ede9d90d18f1cca07a8df5049e13c

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