Malicious PDF — malware analysis report

Static analysis result for SHA-256 778311d99ddbe8a8…

MALICIOUS

PDF

83.9 KB Created: 2021-09-18 20:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4196c363572f9d5b4ffd22a9ffbe6ec0 SHA-1: 65b0012a72f6d17ad8d727ce2d7cc5387de5ba8e SHA-256: 778311d99ddbe8a887a03e1cadc935b98aea6a26bdc719382d1b1a04287d3616
276 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1071.001 Web Protocols

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous links to external sites, some hosted on compromised WordPress installations, suggesting an attempt to distribute further malicious content or redirect users. The document also employs a lure for MFA or one-time code harvesting, and mentions password-protected archives, indicating a multi-stage attack designed to trick users into revealing credentials or downloading encrypted malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://pixomot.ru/uplcv?utm_term=rare+fortnite+accounts+free PDF link annotation
    • https://serihosting.com/calisma2/files/uploads/nozuwew.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/60057964189.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16145e1a777b62---pazijiwamigurotagosulufaj.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/27899979768.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/kepufixus.pdfIn PDF document text
    • http://96stone.ru/userfiles/file/xafoxa.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161409259842a1---25496140892.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/gegigof.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/32156555704.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/mozafebanabumegosirupug.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130b16876036---98323638936.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/tebovaxalixomebib.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/52672949349.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/34165351026.pdfIn PDF document text
    • http://195exim.com/datas/files/kesisanememavi.pdfIn PDF document text
    • http://simonide.org/userfiles/file/wapopubisozofu.pdfIn PDF document text
    • http://mebco.ru/images/file/xazujenepekabepitof.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/40925735189.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc4a71c4d6---nudotazoja.pdfIn PDF document text
    • http://dakov.hu/_user/file/baxaredelebe.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/gezejutofi.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/dofirigogozupidelexi.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/93141327917.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/99338148750.pdfIn PDF document text
    • http://nhungbaithuocnam.com/img-tvdl/files/41026720882.pdfIn PDF document text
    • http://edu-family72.ru/In macro / runtime command snippet
    • 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_off0000dfeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEB 10428 bytes
SHA-256: b990ecdb630765b05986eb64d9813325a15e5485ec9e9fe4ec45aa9c2065986a
font_01_sfnt_off0000f7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCC 19428 bytes
SHA-256: 9aa4bf737853f73c3c6b8365554147544fe1132b4053974bc3af921e28366bdf

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