Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebb343cd0fa6f0b2…

MALICIOUS

PDF

81.6 KB Created: 2021-09-07 21:27:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8b5b546b99aeba91fe69bc8e367c0751 SHA-1: e267889d4a6a8c978f5e0d2f11e9db3f49287445 SHA-256: ebb343cd0fa6f0b2827bd062dc988a568b9d2518c12d99d5dbc62e9a2cf3185a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV and an ML classifier as malicious, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, suggesting a link farm or phishing infrastructure. The presence of these external links and the PDF's structure strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=air+cooled+diesel+generator+operation+manual PDF link annotation
    • http://www.blueoak.fr/image/file/datadotuxetavebaluwi.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/69616457239.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/zexawadik.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/35399024369.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160f6a6b22462e---21799529679.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/dawase.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607d280509b7f---40843784441.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/6aec45de832b5c3751c6c9709f7140b2/luvilabukujodunitikuje.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/8327e24bdd94666752f26882df265586/fifemavagijegodonesov.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/26324078864.pdfIn PDF document text
    • http://furniture83.com/upload/files/77463222446.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/57988952493.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/34369795815.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/f52c448af0608c509b65d5fe24b90dbe/lejawe.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcc54943cc---72348316750.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c93b162f71---50012789897.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/xasudezelajep.pdfIn PDF document text
    • https://homecareangels.ca/files/files/files/jitimugemum.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/7d211ce539937b9462e58c71b6c481c8/89826447826.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/pewuroj.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160876c3818443---pomipano.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1612582a872cab---gosazemelapugelobewimu.pdfIn PDF document text
    • https://drlanda.hu/user/file/72328676277.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/f2c74fbaa0b38c55a82a521269efdf29/44169460505.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_off0000da64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF276 17360 bytes
SHA-256: 7dd4ae997f4e473d92dde238612cd92d610d06913ecb59729cc7af3a6c314d6d
font_02_sfnt_off00011f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7F 10940 bytes
SHA-256: 95e33e48f015c36ee2918a6106a703b337e7882a2d4b25c5e81a5bec337ca449

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