Malicious PDF — malware analysis report

Static analysis result for SHA-256 4167c0cd33a0e5b8…

MALICIOUS

PDF

70.5 KB Created: 2021-09-19 06:22:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 035cb45291941b5b898fb9c7253f2c47 SHA-1: 5bf6fa9b76d50e0907e52dbcc638d51e787b5929 SHA-256: 4167c0cd33a0e5b8754a8ec3f132cf7807ca8aeed9ce9f7b15521b60ad0977d2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs, many of which point 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 for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://arucax.am/user_images/file/judogegenijed.pdf In PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/wiwojujonimurokovamo.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161400dc3c4db3---63407029738.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/80256045310.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/zodidukivowob.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161379abb85b1e---vafezulidexututos.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109100619542059.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/puzaxiwi.pdfIn PDF document text
    • http://patrickstaxi.fr/userfiles/file/pimux.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/66148749290.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/62069921280.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/wadazebono.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/98919640747.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/60577763612.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/fumefupure.pdfIn PDF document text
    • http://atem.sciara.eu/public/upload/file/wumifizurexir.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/438299961.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/kuwejamutudufukugud.pdfIn PDF document text
    • http://riversedgefm.com/files/file/bojumikewunorukusuwu.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b59a69ea56---68562110748.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/wojosiretulufofuperimopu.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/12729217629.pdfIn PDF document text
    • http://brenderup.ro/mm/file/23348689998.pdfIn PDF document text
    • https://phukienbep.net/media/files/40757855967.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=friend+request+full+movie+onlinePDF 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_off0000b5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5EA 15368 bytes
SHA-256: c3d05d6c86b23676ce21afe5ed1beebb24ce5aa8dd163589a99ecf938e11e88b
font_01_sfnt_off0000dc6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6F 10640 bytes
SHA-256: a32319a5302f3d71a3a3838bce32fef64e5280dcf6c3c587acd592d8b177b47e
font_02_sfnt_off0000f48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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