Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f0a8f1da2ce9cf…

MALICIOUS

PDF

75.3 KB Created: 2021-10-08 08:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 59c4a7900b4a758de4deecade8b1f173 SHA-1: ad8344ba483d37da5e83f3d4c574ea136bbd11e8 SHA-256: 16f0a8f1da2ce9cf69be479844e7681b5960873060720e9654289710a50ff7a5
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 WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is a phishing or malware distribution vehicle. No scripts were extracted, but the structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://laborke.ru/uplcv?utm_term=the+entropy+in+an+irreversible+cyclic+process PDF link annotation
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161556ffcdf80b---22376988131.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/26712943593.pdfIn PDF document text
    • http://intertravel.hu/_user/file/gaxapukexuwe.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/70103926791.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/basebozowisiv.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/uhkpa7ot69vrb2v9svdn3hvnm4/baniguwiwumako.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/1dd40816d2dd99c1a451d63d0dcb9bed/80263166864.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/41173819450.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/wezija.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/tudona.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/bagifuwuzubez.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/debizoloroxowosefajo.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e939071aa3---35805274181.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/gotewuwakexaxujotezixo.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161413fce3ecfd---kolufexulifavisurir.pdfIn PDF document text
    • http://handinks.com/ckfinder/images_store/files/64299694355.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/73907826644.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/40090643364.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/30211642887.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/movasosepuxipenozibex.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/12b35a2893ab65c9656598b329cc3a68/miveluzavozaxifojufozis.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/vudafuzaxuwa.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/0281d9b085fd3f2f0a10eeb852aca65f/64220232824.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/55512647302.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614b3122126b5---kanogexozegamuzinan.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/tuzodiput.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_off0000be5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE5D 10756 bytes
SHA-256: c75bcd4dbc59ae57f6d0c70c1140d9453ed2c952b28457f98ad60b04e415eaf6
font_01_sfnt_off0000d6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF6 19168 bytes
SHA-256: 643448564e53ab39d542dc26f83ace330bed8e7627cb9a9256834eec7e6dab1d

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