Malicious PDF — malware analysis report

Static analysis result for SHA-256 e942a0abf104f978…

MALICIOUS

PDF

79.6 KB Created: 2021-09-18 20:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d4c41a4cec853f4553d5cdc6c0faf6f4 SHA-1: 41b31464158d9895a1122a0f284bac68dc5de5c4 SHA-256: e942a0abf104f978f9e2ed219e335820e9e464c50ff9217d4a51f033ec347281
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically indicating phishing and trojan activity. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://laborke.ru/uplcv?utm_term=ghd+sports+apk+for+ios+download PDF link annotation
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16137f06a28b50---22757497971.pdfIn PDF document text
    • http://premo.at/userfiles/file/71570192266.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/goduwitive.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1819a2b6b---xutuweroxovovuzisaxusuli.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/tuxawadulebawekajigadiju.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/9321dd8592c0c0f37f34a223a4ce678e/23986848369.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/taoa38804uqfjsh0ggbfovf043/63814012460.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/c1784ecf55019508300524ad72f3fa37/borunofo.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/82579844242.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130505a50c38---nevuna.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/93762771077.pdfIn PDF document text
    • http://xycrusher.com/d/files/puwowelo.pdfIn PDF document text
    • http://otestmanager.com/club/data/userfiles/file/20210914015643.pdfIn PDF document text
    • https://kstraders.com/userfiles/file/7449605593.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/50377473578.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/nebowenedi.pdfIn PDF document text
    • https://ana-jsc.com/upload/files/geluxexulagixexojevop.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/mijajedeliwewazunanip.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/jidarelenumuvenow.pdfIn PDF document text
    • http://soc-in.com/data/media/files/jupilamelam.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/90380952997.pdfIn PDF document text
    • http://korytnica.net/data/files/gizejewelejopamapevo.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/50312577013.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/72189515715.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/jelelokat.pdfIn PDF document text
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/67586409798.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_off0000d1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA02 18112 bytes
SHA-256: 6dafec2e21363f96950b24f68e8b1db56b3209e95e471b99638bf067e78a73eb
font_02_sfnt_off00011883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11883 10680 bytes
SHA-256: ab44876e27d97f0043fff3384f86bcc1fc74e3c04bf2c3220b00b301073043d6

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