Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2d1c53e7ee8d155…

MALICIOUS

PDF

91.6 KB Created: 2021-08-09 08:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 76ef986d397fb08b1f44e74c5fad6e83 SHA-1: f4b929a760a8f1321f88b5c9b5bf57f021f5104d SHA-256: c2d1c53e7ee8d1558341e7a89c660c94ec1d0413d16485a5a4e359f628d2ef9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially harmful websites. The presence of compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://crysiq.ru/uplcv?utm_term=what+minecraft+seed+has+the+most+diamonds PDF link annotation
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b0969712546---mebanabozigedadefade.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/zegonerazi.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/59138294173.pdfIn PDF document text
    • http://crm333.com/documentos/file/javawexu.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a644bd808ee---kilenuwu.pdfIn PDF document text
    • https://jaiminsales.com/ckfinder/userfiles/files/kowabowano.pdfIn PDF document text
    • http://isgsrl.it/images/file/67855237158.pdfIn PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/11148110966.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/90185565409.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210804130143.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/gumaxuwafenekadavosixu.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210704_11CDDE8774882903.pdfIn PDF document text
    • http://isgsrl.it/images/file/zavos.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e628908676---kazeravejetapozowegozuk.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/tg92ac1r24f2t6q296n13si283/pifivinogadovijidirarejod.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb9a084602---75357497967.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/jetijitolitatu.pdfIn PDF document text
    • https://tavio.ru/files/file/22082757920.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/82332227156.pdfIn PDF document text
    • http://modero.vn/upload/files/11294453989.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d21828752---gijenifafubilobewu.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/66934365642.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/ic46j5ike4fpp3onv7u6ni59th/61041902412.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/161105fb883a7b---63591182819.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_off000102ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EC 10688 bytes
SHA-256: 59a00090edc925f5b03bc83ba7a3dfe8c04e2b80feaa2660e471c92ef10e4c98
font_01_sfnt_off00011b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13359 17384 bytes
SHA-256: 3fa7914b8065fc1bb4254056ef0c42a28f77902d52d377b1df5a38938dc83c6f

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