Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e8949c52495e27…

MALICIOUS

PDF

70.0 KB Created: 2021-09-29 01:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c19572dda738526a50a11f8aa5c0f287 SHA-1: fdeca03c98867a6831269f0f82ba25843391578c SHA-256: b1e8949c52495e27b1e38a654c2b186c7178b8b35cf26a2bb66c971af6acc9fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. The embedded URLs, such as 'https://pistant.ru/uplcv?utm_term=digimon+card+game+2020+pc', are likely used to distribute further malicious content or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://pistant.ru/uplcv?utm_term=digimon+card+game+2020+pc
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/161537f6d18964---muwifa.pdf
    • http://denprokhorov.ru/images/file/xegegolupuxalibenidof.pdf
    • http://lnimeina.it/userfiles/files/jagipazufanunixesivejeti.pdf
    • http://paradisoseminatrici.it/userfiles/files/tijobam.pdf
    • https://arichaindia.com/userfiles/file/37390850650.pdf
    • https://cargotavio.ru/files/file/40594636964.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135510e95eb2---33310623105.pdf
    • http://esangsok.com/upfile/files/60976663362.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16139d36e9caa2---sudozuposimeno.pdf
    • https://cliniquemyo.com/userfiles/file/92299604465.pdf
    • http://lammermoor.net/imagenes/file/71512856683.pdf
    • http://kipia-nn.ru/userfiles/file/viwesedidifuso.pdf
    • http://nonstopsushi.com/uploads/files/rozok.pdf
    • https://worldpigment.com/image/upload/File/70711344138.pdf
    • http://zgkimsteszew.pl/img/upload/files/36338757836.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/161447812bc36f---soxewatemimikenuwud.pdf
    • http://pro-group.ru/userfiles/file/36715351984.pdf
    • https://wtmasonry.com/ckfinder/userfiles/files/sikaturazu.pdf
    • http://thebookmarkcafe.com/uploads/files/dibaxidotokuxaxinemu.pdf
    • http://zekejozsef.eu/FCKfeltoltott/file/xanumi.pdf
    • http://tatooazh.ru/files/files/raxejuzanezizumedikabu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000affa.bin
e5553d7d8fc7cb18c3b0f24071950984250455951bcd98c0f9ce52bf5920f71f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFFA 16332 bytes
font_01_sfnt_off0000d998.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD998 16792 bytes
font_02_sfnt_off0000f1af.bin
9024efaf0edd2973052ee5a49d6c4ef8624a1b541dea5581cca5ab3f362cc98c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AF 10788 bytes

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