Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bedf3c19a4caa79…

MALICIOUS

PDF

81.8 KB Created: 2021-09-02 10:35:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dc8af76664ba287313e4ca26a55855dd SHA-1: caa157257acc7455d5b4e473ddcdec155e2ee6e0 SHA-256: 9bedf3c19a4caa79a819d6e075268c2c9007a2e816d80d60c9e5c6650f0e3546
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, many hosted on compromised WordPress installations. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://nomylo.ru/uplcv?utm_term=by+contrast+to PDF link annotation
    • https://www.leeja.co.uk/wp-content/plugins/super-forms/uploads/php/files/10052e2b4f1647be9440104ff31c0326/munorum.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6aeb226c2---40406609653.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160ed7c0c4a5b2---43981504377.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/3cf093b5ea87e1705fd8fbbe20479a9d/99133335303.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/27058905114.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/5973779332.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4a6bf3d5f---16370106185.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/bbae4c80a037cb270615a5ed23f2286b/tativeledivafuzuzulegil.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/gadapiwupiro.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/51083689174.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/zuzevezemixodobonid.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/u81gjre3vhkajtv2q0p830tht0/likewawonovivifaluv.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/fuvenoli.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/xabozupekitum.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/40596144320.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210825064444.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/ffa87c2d4a90f42262dd82abcf0f112d/13499792686.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/84121287388.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/77679130111.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/a3886b2f25b102dadcfa74bfc0a23812/45863794489.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/10089929064.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/6c129e39e627c8388db3e29036842ad1/setukop.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1608d344f75fa7---97239487234.pdfIn PDF document text
    • http://mrsgladysosei.com/clients/f/fd/fd76c46f75d01f7adbe86f52c2a5b8c1/File/jorasitalakakofekus.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/7431925649.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_off0000dc2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2F 18116 bytes
SHA-256: 84375b796bc26df3acc45e736a411af7ce0fdc682d8a2fbf5ffeb9f56b65b495
font_01_sfnt_off00010ae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE6 10120 bytes
SHA-256: 7538bfa30171baa95d4283efe114fd0dfa186f77ded0c856809821f6740316ce
font_02_sfnt_off000121b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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