Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8c7cb0146943f49…

MALICIOUS

PDF

94.7 KB Created: 2021-08-03 14:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: ec59fe77026978bfdf26bb823fa44878 SHA-1: 4b65da4be8b6f600d32a8a57ce9780608dad4e8e SHA-256: e8c7cb0146943f499f8775c8a57309327ac7b7f5b13a081749f990ba3857cf98
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure suggests it's designed to lure users into clicking these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://castudio.eu/userfiles/files/27275820094.pdf In PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ca670f4af---povotuluninuwukilaveteza.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/xoxavaza.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080587480bba---47208343250.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/2044396307.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/kopopobubokesat.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/20980880876.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/b9lp7hcsp54rvu7uacd49g0g23/ruxubujorosamo.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/7m0npvhrnmbgg0k2mps2u1hf6t/82125595568.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/22451855283.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/xazoko.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/d9tdbo5k323uf340k1fs4gene6/jufezogaz.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/c3qumkbp3d9ji7jmpcj93dapul/vajuwufosanajotas.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/991501ee13a87633e6e3fd6200ac2fca/kanelesoxi.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca04e710a2---jibepitetedexakagobete.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/46489875617.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/81199758551.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///pupinopotefojuke.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/pazakifexusag.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/96317555587.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/67255433999.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/29998240527.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cb0ddd27d---75462094072.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/40060976378.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=como+instalar+una+impresora+hp+deskjet+f4400+seriesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D5 19060 bytes
SHA-256: 703be05bce447a8270a9ab2519f608254b2169b8090910649a136f5c9cc9a0ab
font_01_sfnt_off00012261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12261 11316 bytes
SHA-256: 83a337a16f26b57450ccac1350bfd4c1b343112ef2beb4e956c5e135fc49d4a1
font_02_sfnt_off00013cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC2 16084 bytes
SHA-256: dae5038d748b2b7d89173d83a61ff0ceefc2856cc76f3bb6f5837745f88f8889
font_03_sfnt_off000151f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1