Malicious PDF — malware analysis report

Static analysis result for SHA-256 17c1f980d417a2dc…

MALICIOUS

PDF

80.1 KB Created: 2021-09-01 02:25:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c84503af06929b672a0a9e8142ae4a14 SHA-1: 2f021471ab0961a30310fc935018beef4dcd965d SHA-256: 17c1f980d417a2dccb1840403de094bc0d716ca29cdbd63f026ab925091adbb0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to host or redirect to malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The presence of external URIs and link farms indicates an attempt to direct users to potentially harmful resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b15b1d332ba---3048211160.pdf In PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/71745665262.pdfIn PDF document text
    • http://zigzagontwerp.nl/sites/default/files/file/29637859271.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/65kfu20npi0olkh6fafh0831a2/nazirebefejazomawe.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/pltc728am9inmh92guk0l2ce4a/redopisu.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077d47723771---tilafiwiredilemonuxuda.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/49114292533.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202108/file/1629261498.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/52937409092.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/mekejejunewexejovexap.pdfIn PDF document text
    • http://atomleasing.ru/media/File/xegokejubiz.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f377a9d949---11506029711.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/suwekab.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/1b25bda29e29c9b3aaef8a81826c3771/60216748937.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/67280763689.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/mosafojabojutuzezumujid.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/27301053215.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c8049d8e0---29927373512.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/20262494124.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086197f61f2f---bimibena.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/5187241050.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/livivuboxolarolomasaxudim.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/jubezebidef.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/xetubifoxa.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607587224b056---82791139593.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/nhitkdr0ogga6kjqepbjfl4o2r/pebamod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=battlefield+of+the+mind+free+download+pdfPDF 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_off0000d0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E4 18948 bytes
SHA-256: b60476b27d3453c5a456b300a9f54ddd92e310d788a92412411f0de7317932f7
font_01_sfnt_off000100de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DE 10732 bytes
SHA-256: 1c89cf734e5c7aab3fc27ac29b258bdfc5d1c952d165cdb8baa7ab03d0106475
font_02_sfnt_off0001195f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1