Malicious PDF — malware analysis report

Static analysis result for SHA-256 90dbec2f573db34f…

MALICIOUS

PDF

70.6 KB Created: 2021-08-27 16:01:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9dc01a081a91352fb97912d2dc780ad0 SHA-1: e96c8b072aca585c4a5a835a8bdd9ed2ca1dc37e SHA-256: 90dbec2f573db34fa4f2aa77922c5cdb113f6155f2494c97b0fcdb10655cf257
176 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a phishing lure, including a small file size and a high density of external links, many pointing to compromised CMS uploads. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were extracted, the PDF structure and numerous URLs suggest it is designed to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://www.aportecnica.com/imagenes/editor/file/mamini.pdf In PDF document text
    • http://newtarrytowndeli.com/uploads/files/gikesiwavitagi.pdfIn PDF document text
    • http://generaldistco.com/images/file/7951655868.pdfIn PDF document text
    • http://skyrybupaslaugos.lt/uploads/files/rupuludejipelanab.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/kijit.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/aaba0161094e6654d2a39b5435aa5feb/fopiwinitamogixojazadej.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/99009016031.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/4775038268.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/wopibujevusewabidig.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/jodinavuwidofeluw.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf523ce627---87267711030.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/pizodiwigim.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/50573699449.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b642824ede4---rawotibemijamagusus.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/49326547e9db40c1a74ad17296524d4a/vupivozoxowufusigal.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1611e966a0ff4e---dubasug.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/b5674ae810e0d50cb8f1e0560a08f84c/53295046487.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/85973674149.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/49724359932.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/0c8245d14be6e79fa2bcbd31ccaa037d/71704843237.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/c7ce9b03595870144e827557cbb5f2e9/jexamisoxeximolugagi.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/pasalejiwo.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210628_063300.pdfIn PDF document text
    • http://bendhorseride.com/userfiles/file/13344060038.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa667536e37---fawasigisesukogiliserif.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/95a1d8c022ca8c3e5fd628a4ddecb526/resebidokunanoxogilo.pdfIn PDF document text
    • http://markone-tools.com/upload/files/zusigibuzisedepuvogi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=meaning+of+chola+in+englishPDF 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_off0000b72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB72D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3F 14560 bytes
SHA-256: 95c8534d193523f668a7e0e0355d17e4bb0154b560f5174d74d0c2fdf0cdd206
font_02_sfnt_off0000f35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35F 10412 bytes
SHA-256: 221b385a1007690323244454dcf6a52d65b6d378569757a2d0fa449b4eb79036

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