Malicious PDF — malware analysis report

Static analysis result for SHA-256 df166d48fa718042…

MALICIOUS

PDF

72.6 KB Created: 2021-09-22 11:08:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 35149ca2f21d7c0722dfab4096dbf352 SHA-1: 08232a0315a849475cca23f1131238812d8fc47e SHA-256: df166d48fa7180421981b2cec3bc232b41babd5a8c3aa8fcc8eac4b639536187
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/2e0fee065e6b31f2bd85d77c4ae41a9d/66784083300.pdf In PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16142c9af91fd1---82980122926.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/22810572075.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/91084429701.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/tetalobafisol.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/zufaxibejadugus.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/29020424158.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/161367b7858cef---84287076238.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/sebapobosupurepudinekaw.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/segixed.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109081644082542.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/91360959452.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/fokopufarove.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614321692cb0d---pupefepopejut.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/fabul.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/mogazuvojofigunu.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/42116447457.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/detumonedusobivo.pdfIn PDF document text
    • http://rrmkaryacollege.org/rrmkarya/userfiles/file/39595347803.pdfIn PDF document text
    • https://insp.biz/img/file/futogitaramubukuzinuluj.pdfIn PDF document text
    • http://kalikraft.com/images/file/pixixafosonipo.pdfIn PDF document text
    • https://digireg.com/upload/90165827472.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613471bd0441f---vopaganawid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=bodyguard+series+online+freePDF 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_off0000b8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E6 16892 bytes
SHA-256: de9d421fe93c805c08c945ae83d0a7fc15e7bcbdb0f5f5674efe12908830a5ee
font_01_sfnt_off0000e4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC3 10700 bytes
SHA-256: 0b7063812b6398c8429cd4fa7a726ee4669f2bc861cf041bd848be7edc5c88a9

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