Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dd02aeab3b5349e…

MALICIOUS

PDF

74.5 KB Created: 2021-09-19 02:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e8646facf26097e6c18b4f2d1607ee6f SHA-1: cbf095dc2234ac7c7eeaf2a2f4d9302c4be71130 SHA-256: 3dd02aeab3b5349e8fd1dd4f4edf9502f0074f935a450aca9176284f11b0c78c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, 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 lure users to malicious sites.

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://smidgel.ru/uplcv?utm_term=real+bout+fatal+fury+special+apk PDF link annotation
    • http://parcroyale.hk/userfiles/tinetanagiravaxexa.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/dujedebolelabibejo.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614449d946a0f---xalekizega.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c93e45730e---vakozadipokefetak.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/17524154540.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/73696982593.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109100437133040.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/89222201054.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/83388315757.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/gapufokiruvadomun.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///17328583849.pdfIn PDF document text
    • https://csn-alliance.com/data/files/tubozuxivewukizewunogudop.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/jawerojutor.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/togogurunesazadimopunaju.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134b1a22543b---zepojozovifalamotizikus.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/2892d452add8fcd88796d668f15e9d4d/90082766465.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16145825636802---viwagojivanikalurugonoxo.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/fatutusivumujo.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/23318135605.pdfIn PDF document text
    • http://cjpharmtech.com/upload/files/nuvuzok.pdfIn PDF document text
    • https://awinresource.com/uploadfile/file/wosutomu.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_off0000be3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD653 10860 bytes
SHA-256: 2201770ee0f8a0fa3d265eae26f0d5d3f46baf598961813273ee603382bacdc6
font_02_sfnt_off0000ef64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF64 17168 bytes
SHA-256: 554a94226acbc30d33b66eeff8e687d8fb9fe66cebe5eef7567a9a9ef79f3ff4