Malicious PDF — malware analysis report

Static analysis result for SHA-256 b39724135135483d…

MALICIOUS

PDF

90.0 KB Created: 2021-08-26 13:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 14776bd19b123677438911920a80aed9 SHA-1: 5d82b8dee989b85436b66d4725e79ef771e3f928 SHA-256: b39724135135483d0135bc6966a1048c1b63f3f3eadea3d6a624af2b000023b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It functions as a link farm, directing users to multiple URLs hosted on compromised CMS upload directories. The presence of numerous external links, many pointing to potentially compromised WordPress sites, indicates a phishing or redirection attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfa8bb8b7a---zibib.pdf In PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/cq1u3kp7egls3vd94n8hfo58mu/20551220466.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/8f7b9105304357d349f25821f4f67efe/4430137259.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/7572b3m14801s0knvqued02gvg/xugidazunabuzojomabat.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/kapewifokok.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/tugitaguwirenasiragivaluv.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/2l424phrtsem1ctmjpiin41eg0/rebuforenikomif.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/togipejojupewut.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/nebol.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/lekipo.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/siwevekafaximobofopem.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/lagurawoviza.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/reguba.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/jinurevoludomirulom.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b40bffb5689---97164020595.pdfIn PDF document text
    • http://anupbolivia.com/images/files/kagesuwamaxakato.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/84076341030.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/9ihvrfdvobi64q6rkh94pf63jh/12548207303.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/fagitevuvopavebixegova.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/devir.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9576162114.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/popafijazumiwarogewa.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/16233552043.pdfIn PDF document text
    • https://zlato-eu.sk/upload/files/8779637336.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/guniwevisovisaniwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=you+are+what+you+do+philosophyPDF 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_off0000faad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000112bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BF 17280 bytes
SHA-256: cdd2fec2b6f771338e6aed8daf84c9161854cdf431edb43198423dc0326cdfe4
font_02_sfnt_off00013f50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F50 10668 bytes
SHA-256: 362fee19c163abf0b45be1232553ce5ff3fcf4202ac2e1254a397ac479da8ac3