Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f861c58cf33714c…

MALICIOUS

PDF

88.4 KB Created: 2021-07-22 02:09:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 38bd72325bb7b2150515cc6619af46f2 SHA-1: be5ea09565ec96a7ad35be7e1188e7491652006f SHA-256: 9f861c58cf33714cd108b60cc2629192900997a6caf14f34cd9dc4c49d6eb558
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a focus on directing users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soechi.net/userfiles/file/68142225171.pdf In PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba80ed1bda0---vowatebawito.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a49db5c8fbd---26897877867.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/muxevuridosi.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/c8fv8fm3t4qq5ptufpru42ggu5/69352255639.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/gltsta9ls39rqq7sjat86878co/60039120234.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a509789936---10105497408.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/6873397291.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/23108734489.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbd395eec5---54226502674.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/5cs12bqil1o104acmreuaok9jl/18543730349.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/89df2d5e76c72f79d49071a306e54fce/wopowogiva.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088ac792cff7---zudovilorene.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/195699947df41d98eaef3049ed4a30ad/wibusolimi.pdfIn PDF document text
    • https://laser123.com/geektic/files/52017993980.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2b49b43c1ef908825b6e379e4232e6a8/pufibenewegigoserulomat.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/puxaxomitame.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b0c9a8418---zugagafatunufoxesejifax.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/34596511117.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/sozedupakopitebo.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/ki8pbr0dkjdj6f2v253p73v0j0/60260158257.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/17537895623.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/qr8tucduqh4npvn4u0bqj4atom/rewekavizatemitokokif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=watch+were+the+millers+online+freePDF link annotation
    • 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_off0000f2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D7 17996 bytes
SHA-256: cef80396a966895ad75e1f7995a76ab40787aba7678011a7a46efe9afb01c1d3
font_01_sfnt_off000121d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D0 10680 bytes
SHA-256: 9b6cced47c46c07c0c812d1866c41615c194af7e22fbb5c5b433c82601904ab3
font_02_sfnt_off00013a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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