Malicious PDF — malware analysis report

Static analysis result for SHA-256 d29299a68711bd4a…

MALICIOUS

PDF

76.8 KB Created: 2021-09-03 19:00:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c2762f2c3b466e0c79453d67d3e3584d SHA-1: c1432c6235d88a3fb3077840deb1be65ea758dc3 SHA-256: d29299a68711bd4af346c41e651cdb6edbf0bf3eb3b453ed4fdb41d6bb2377e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous external links, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of using the document to drive traffic to potentially malicious sites. No scripts were extracted, but the overall structure and heuristics point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://medvor.ru/uplcv?utm_term=online+word+docx+to+pdf+converter PDF link annotation
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/sulixiluwefuzawakif.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb71c699a0---20144893108.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/jotaruviv.pdfIn PDF document text
    • https://geniodelweb.com/file/fagubalasix.pdfIn PDF document text
    • http://beergolfers.com./blog/images/file/waxibajozunabanu.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cfd7c63096c---pepolasutezobepemotidufo.pdfIn PDF document text
    • http://jarosi.hu/files/file/15671814675.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/kagajajudu.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/56548177138.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/linorisasojolopesadikoj.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a484bc212d8---22677669735.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3196138c2---tatubupasumepatikafiwaxov.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/fawirebosuw.pdfIn PDF document text
    • http://primehorseproperty.com/userfiles/files/8130193508.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/nakoxizuwadoluj.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/a3a896e6a642c89398aca5b3a08c40da/salawetogikakesap.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/24903933280.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/de5f8c9f1cd7237b65646547bc87e79a/napololenodi.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/24754712663.pdfIn PDF document text
    • http://topstec.com/d/files/42023799730.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/57553070033.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/27bff6376198527dcf4f1156958c267d/50855375032.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/reziwe.pdfIn PDF document text
    • https://nenanhduong.vn/Upload/files/61692324350.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_off0000c8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FF 17052 bytes
SHA-256: add1884078da9c5c2ef088eaf1fcbbd43a1b80ab2098b524e34ccb135a0b9f4f
font_01_sfnt_off0000f545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF545 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5C 10560 bytes
SHA-256: 62d9e9f12961bc0df528062ffcc3d37d5b911fa4b90022998fbbb544111b4aa9

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