Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b04f7338ccab986…

MALICIOUS

PDF

81.6 KB Created: 2021-09-02 19:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 439fd6ae8ca7302326ceaaad4c21824b SHA-1: 1c1df41d8f89ba21e7afa67034a916c7ea8ab55d SHA-256: 9b04f7338ccab98621e2212a9bc191922b6ac1a9d905023e496081d3bd3d4459
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URI heuristics and link farm indicators supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://chcial.ru/uplcv?utm_term=download+software+to+reduce+pdf+size PDF link annotation
    • http://www.allatpatikapecs.hu/images/file/45863490477.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/aa3a2462b94e251af8f166546a6adae9/7280249225.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeff06dcba5---24428363018.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/3f5dc0e34ccc3a3478eccf68f96ea5de/figotuwiwanagivopulajenu.pdfIn PDF document text
    • https://limsurdua.com/contents//files/dorisamofukedem.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cdcb9043a97---tolokemizomofapew.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c29089492f7---92798804249.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/1d9d80ee96eaf7a7cd6582c32cd8ca97/11340356359.pdfIn PDF document text
    • https://aildf.in/userfiles/file/nonosezamewonuvufi.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/kuwuvidulo.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830d6e6d868---87726820632.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/dutarovevozipawa.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160728a477eeb4---wumenijidulipiwisazasu.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/8382b62fbfff2dead8a6a5f4f4249d24/81867168163.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161217fdfe9c45---29685329319.pdfIn PDF document text
    • https://condominiobrisasdelnorte.com/userfiles/file/xuvavesusofufopevogome.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/dalilisajijaxemiwisadis.pdfIn PDF document text
    • https://elektrona.cz/files/file/45970701226.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/marugebus.pdfIn PDF document text
    • http://cjatkinson.com/userimages/vizesolokumezudatopika.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe52a40e9f---78098384488.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16096a0286b4dc---fokunozafivawerifizi.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/2c2561589091e08b9d7aa271132c0444/xatab.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_off0000d9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F3 10860 bytes
SHA-256: 15be9ab6deffda8d233ed7975de3d10beb304cb3b8f43353e70b1430877f9aae
font_01_sfnt_off0000f339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF339 17436 bytes
SHA-256: bf85a34ad22b4bb3f0b13917faa681581566c9344e65617d2ceff27225280f26
font_02_sfnt_off000120a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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