Malicious PDF — malware analysis report

Static analysis result for SHA-256 617653b901ba6ac3…

MALICIOUS

PDF

78.1 KB Created: 2021-09-19 03:18:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 83483f1ef21d873fa398d89cc6f23384 SHA-1: f1c417feeaeaccd1a62301465e770019f4d0623d SHA-256: 617653b901ba6ac3c749f50bc83cea0168d82bb67b434a0120f68c8526dd25ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a large number of embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this phishing and distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=free+fire+cobra+hack+mod+apk PDF link annotation
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/4db05d8e92a0a4dfe05fbefdf7a8658f/66704470203.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/97033994793.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/15588301886.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/99b746cadeb3001d51c61f43efd76c10/bixizebedimagiz.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/kadutamodigofaxaw.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/vuwexasetudexaf.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/90697617512.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021090822441380554.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/nudesojisilalutu.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/91030225854.pdfIn PDF document text
    • http://synphabase.ch/upload/file/11457948692.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/malebunebaliwikitus.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b4bccc231---38239723243.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/90522274858.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/97165180126.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/zarisetupakilosuzenove.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/jolakifagu.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/76257177963.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/xisaronabuwowutes.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161317c998b675---76734518306.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/vomab.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_off0000ccaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAA 10680 bytes
SHA-256: 80d78d5ff4f27019b504f9dd41724164a680c5529230f1203564035429e2c6ef
font_01_sfnt_off0000e4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DC 17664 bytes
SHA-256: 6bbf1b97c86509706f49af62817b91a36efeefe5c649ac4d7ac8e65a7f65bcb6
font_02_sfnt_off000112ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1