Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5e793dccdc0295c…

MALICIOUS

PDF

84.7 KB Created: 2021-09-03 07:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ee79070d977208b4a3e6f6b1eb9e4d10 SHA-1: 274dc9d37caec9e0d0603839d6d1dd6d3cb60e1a SHA-256: f5e793dccdc0295cfbefa68582499828caf266e3cbcf3bcea00dfc47bfff5269
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS upload directories. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/pl8gl1ll7vmnr41584q5lu8fu1/10159326270.pdf In PDF document text
    • http://bitite.lv/media/txt/122/file/16657843748.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/99039028848.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/vuzusasokodinu.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/33469275946.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/masenugoke.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086aa7b2db53---dojixusoji.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/e494be33cc1c5d23615766355c6f34aa/wekolimatexesome.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/febig.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/xiwikonukekixabufogiwa.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/86107092501.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f215edef77---57804891823.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/16490314306.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6d10ec7edf---29527552879.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16098392bd121a---sokimagukalakadezeso.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/es2n1683nfq18dvucggdcoqet7/fiwedikezulibaxuvezaferi.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788f7189668---juxufejapulojifanuxitusu.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094f2f679e80---24546139387.pdfIn PDF document text
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/60882994588.pdfIn PDF document text
    • http://nhaphangmy.us/upload/files/bewokevuduxetobumibilala.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/93248969916.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/tomikeralokapupubufupal.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607f88b582f5c---86297875778.pdfIn PDF document text
    • https://thietkevuphong.com/uploads/image/files/9921606536.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607d07be1ca6b---39511114230.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=ukzn+postgraduate+application+forms+2018+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_off0000e174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE174 18472 bytes
SHA-256: 06bdf69b1e7a2b78519d984b7fd009374ee98993572451434196b21049c5d503
font_01_sfnt_off000110f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F5 11724 bytes
SHA-256: 83dccf163e2fb7dbc626b72215c16b5259e7842769aab05472bf143ee6c31a6a
font_02_sfnt_off00012ce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1