Malicious PDF — malware analysis report

Static analysis result for SHA-256 d799850c9c3a57af…

MALICIOUS

PDF

87.2 KB Created: 2021-07-29 18:13:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6054f814f9e08693382708e982c49548 SHA-1: bf61f45fdb08ca4611ca04c9091f10fa44e68e08 SHA-256: d799850c9c3a57afe06243f41d2fab40324b01aaaf2d95640674c267f0eb6dbe
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1071.001 Web Protocols

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links to potentially compromised websites, suggesting it's part of a phishing campaign. The presence of heuristics indicating a password-protected archive lure and an MFA/one-time-code harvesting lure strongly suggests the document's purpose is to trick users into downloading a password-protected payload and then potentially harvesting credentials or session tokens through a subsequent interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://cec-intl.ru/app/webroot/files/file/86261230221.pdf
    • https://floraplant.gr/FCKeditor/userimages/file/tatezijegerifufok.pdf
    • http://enricobarraco.com/files/63992776197.pdf
    • http://xn--b1akwe.xn--p1ai/userfiles/file/dunuxugiwofuzowagevanes.pdf
    • http://commandhousecreations.com/uploads/files/fokepun.pdf
    • https://highrise.pl/file/74616641099.pdf
    • https://cmsschoolkg.org/userfiles/file/3971495831.pdf
    • http://mulroyenvironmental.ie/userfiles/file/jubolagokirokaloj.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16092abc6e6200---latedogupigevapiboginub.pdf
    • https://abofahed.com/userfiles/file/49590315252.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a54248564d---kabopexodewivitefumar.pdf
    • https://service-panev.com/userfiles/xopunuzezatumidefakomekip.pdf
    • http://limeitec.com/upfiles/editor/files/80754920192.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16086b19c3a9a9---5706969160.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a493558e9---41508113339.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c00aadddf6---54785984941.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d0172a4a2---bebigowiwefubewi.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf7f01d8eb---sudujafani.pdf
    • https://cerquilho.sp.gov.br/public/admin/globalarq/uploads/files/20518287396.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe2ec9e9d0---13397118793.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077cf8b63317---66135274519.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/32782438960.pdf
    • http://studiotecnicomartani.eu/userfiles/files/50123230830.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab70333b784---nafunewivar.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+download+aadhar+card+jpg+format
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1ec.bin
44d52c9d8fc74c59bbcb5c81b3a2dde4346b56ce85cfb1ea1339c311cf3c3225
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EC 16796 bytes
font_01_sfnt_off00011df2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF2 16792 bytes
font_02_sfnt_off00013609.bin
7964d7c6fd6b447059e158d752d0f222b6b36936c00ffd27727fefba17f2e1af
pdf-font-stream PDF embedded font (sfnt) at offset 0x13609 10884 bytes