Malicious PDF — malware analysis report

Static analysis result for SHA-256 6252ff389206d917…

MALICIOUS

PDF

89.0 KB Created: 2021-06-26 06:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 968773e38bd5dec12493bc765051af4d SHA-1: c52bb158f34c4acbfc01e4371b7c0ce329a80c14 SHA-256: 6252ff389206d9176f9935a7a1a0ed825a0519a511134eee80f3ca68a8bcf667
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised websites, many of which are hosted on WordPress installations using the 'super-forms' plugin. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of these links suggests the PDF is used as a lure to direct users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/7vvu5ls0pjfeonq857d9anl4mh/3650558510.pdf In PDF document text
    • https://info-jimukyoku.jp/lot/upload/files/kejowef.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/pupej.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/3t30sflig0gem8nd0a5014fsl7/37177142614.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/fhc14ti3a3uf2ujet10cao9e37/litewemekape.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/07e42ded7c15b0a11c8f7673a669dcd8/buwotegazurepiduva.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/87974558594.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/c5a4227a30ce434b533a5ace9fb25515/nijoluzosixedezizap.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c22d67f07d1---motif.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/divadiritali.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/9b2ea9160bc53d126203e855b0ab5d0f/7756760425.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/768c4937a60dd401c6703d4dad3ffdbb/detodegi.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/c670c76b14fb688234a6cb09231f3266/xupaxox.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b876a28e4---13010638927.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b785c7b0c4e---68199182804.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/29554080910.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077fda2bbb79---kewijafow.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/89329892079.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/30455300000.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/90576254608.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/65161948613.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/e58aa5c92f7dafeacd40518e5ac0f44e/60266237349.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/e611c58e729584bd419804f25661706e/zafupodefekujoteriv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=types+of+survey+researchPDF 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_off0000fa1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11230 17228 bytes
SHA-256: 5be7451fdf86c599535f876f12b4a7c8f3744fd574b841923e48c7815fe46c60
font_02_sfnt_off00013f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F1B 10480 bytes
SHA-256: 4dd7e33102c5d271d2f1b3b46d978aad9c014bfdf3518e770cbf0a432145bd76

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