Malicious PDF — malware analysis report

Static analysis result for SHA-256 61c41b9f1383470b…

MALICIOUS

PDF

89.6 KB Created: 2021-09-15 11:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e3abe576c1057b219411dc863376d789 SHA-1: e6cfad18e436336f76cd5a4d08f63eccc6c9b6a4 SHA-256: 61c41b9f1383470b558bbd293a7b40590c7966cea9eedb8c8e3932ca0c99a470
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 a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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.afoa.org.ar/backend/ckfinder/userfiles/files/fodekikusefuvabarovuma.pdf In PDF document text
    • https://hse.tw/upload/file/50054627726.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/52278207796.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/rixesered.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/45508756033.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/66275976481.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/66623816711.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/7905b182bc13ff486dd0fafb180c5ea3/powuduxidaxurip.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/81945895237.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/fd2a0473d823b21352839967b366d42b/wujavevemanu.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/0719561c37f1bd3c6ab823573cd1815f/baxobun.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/femipelimazelosedaxawoke.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/zikunixegujozelibokegaz.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/73477195863.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/009144ca88feb86a8686851cbb9d5647/9256231328.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/5f009bc61923525ee0dd786084909824/xetuvodiwobenumupi.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/8adb6c5decd9d379a37717f71bdf7185/vabiriw.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/78743308697.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/zapexe.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/83792477329.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140106446931---gokikidawopotajixa.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/nitegaroretilasorix.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/xujolozadosovule.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/66334366999.pdfIn PDF document text
    • http://erictex.com/ufiles/files/65710172792.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/nasegitabosoxizi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=mr+robot+episode+1+scriptPDF 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_off0000f709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF709 19004 bytes
SHA-256: 5feb888c9eaca5e5ee1e9ba15ab297c23b8b36254a0344a736ac07a19157e095
font_01_sfnt_off00012921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12921 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14138 10380 bytes
SHA-256: 36237b7e13832bd8976cb1634d4dc8f70440ccf404c7cb01f79b40cf05309359

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