Malicious PDF — malware analysis report

Static analysis result for SHA-256 7967961d8741ca28…

MALICIOUS

PDF

90.4 KB Created: 2021-09-07 13:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8ea7259e67b44d178506fc3ae87e8f9e SHA-1: 8fdaf212fbf4ef6bfdf17b74f083d21d3863420a SHA-256: 7967961d8741ca28633f07dc177480964200097be9e2b87ea7699815aa0fba8c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs, while numerous, do not contain exploitable content themselves but serve as a redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160abe3126923c---desorowulexodijirog.pdf In PDF document text
    • http://nhadatv.com/webroot/img/files/gevuwekejanol.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///nudilajiretometiwa.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b67c995f911---10595856597.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094666ee1384---14958155073.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/tisapesurovuluwazedete.pdfIn PDF document text
    • https://daks-96.com/f/uploads/files/27182856752.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/b1c9bef87a6edae791697719c638bead/musepebid.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fe3452a5065---813400718.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608008749211d---fanunutaviwufima.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/ktrf4fd7vglq3kar52an68mi1r/27900900012.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20216211719273016.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/23555137589.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/6100085603.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/galepelaguzo.pdfIn PDF document text
    • http://synfarm.com/upload/files/diviwafe.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0740ea6581---32319866337.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/47639699788.pdfIn PDF document text
    • https://hsse.cl/files/bobabozu.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/puguxumedugid.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/vabonolamimozami.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607da2a8b7402---gokezidiviso.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/48777218082.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/2e75680ef974c963d795e6029d36a0c5/97413218955.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/q37oaj4d6eb1th2fo9f2rsbqvd/68055824689.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=critical+ethnography+madison+pdfPDF 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_off0000fbb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB8 17864 bytes
SHA-256: 3f7192e7d74abd50634f589600622f09c7e4226dc29641a86b30d01431e98e7d
font_01_sfnt_off00012a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001421a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1421A 11212 bytes
SHA-256: cdcfc65f4cc86acdddd15f9f8cc8e70d26204b34f92b46d7859b7bbc586764c9

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