Malicious PDF — malware analysis report

Static analysis result for SHA-256 3be244b5a0a962e8…

MALICIOUS

PDF

87.8 KB Created: 2021-08-04 21:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ff7dbd1b717927f8f61ece93ba9d9f1e SHA-1: dc43b2ea8a2432fba4e28079a04cc1e8e6670b56 SHA-256: 3be244b5a0a962e8c7a0c4d7bea535f108be9a505aee6adef68ea3b4a8f12ec2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://catamma.ru/uplcv?utm_term=can+i+charge+ps4+controller+with+samsung+charger PDF link annotation
    • http://cokhiminhhien.com/media/ftp/file/fizigimuz.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/10502900174.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a9846ac87d7---89081246974.pdfIn PDF document text
    • http://limoride.net/gallery/file/6962330584.pdfIn PDF document text
    • http://bjjiffy.com/upload/misox.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a98cd3bb5c---fudubexovifugul.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/dmbs628mbmgllt08e5urt7ei50/gajelavewoma.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/pnvvlo7iedjqnc248gvjdnqt3n/zirilinazedarowafevixif.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/a06d089260331a32eb1e786ba817f891/10758462992.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073b1cb8e7e7---50414216371.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/a7b802ca8a31911c60c214dd81058136/kibozaxidip.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/fa697342fcc929dcad008160e4d081e3/5477855299.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/60011593434.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/tigabunexukibewazo.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/3b1e6e98ac6b3c6b86e31030487f4eba/57963042042.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/93427229933.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160887ad1e3a72---minomugozevisuw.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/bofalunibo.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/fakebudurikisefi.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/7ebb3de3c1729a5f741041829da11a19/96492245585.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/foposikivina.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/neloruzabefenokopapobuxe.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/5resuo0f437gdg1k4tslft9u04/46376616067.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c016e5e22---sijeb.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_off0000f0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B1 17428 bytes
SHA-256: 3edc3eba09b87ff5bc47286996438c5e1b5cd1a105c1d7676842c67d23d43761
font_01_sfnt_off00011d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D53 11116 bytes
SHA-256: 67f19a0c58de8864a484b295a6d15232b6bab32c67a4beac7ca21578c76d9a89
font_02_sfnt_off00013731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13731 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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