Malicious PDF — malware analysis report

Static analysis result for SHA-256 7132fe0607ba3ea0…

MALICIOUS

PDF

81.6 KB Created: 2021-09-06 04:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 38ce8f062942aea4a14985372f7b6625 SHA-1: 70a993334adf6371e95abe4fd778dae0d7a585c8 SHA-256: 7132fe0607ba3ea09a2a99676a706b605384b114d39239ddbed7c1ea8d9e7cf9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely serving as lures for users to click on malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://allytemp.ru/uplcv?utm_term=suzuki+raider+r150+owners+manual PDF link annotation
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160728d87b4622---jefijokexapuramar.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1621602101.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d9491ff10---96487835716.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088386ed4154---jipapeporotaxolesomibamo.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/ketudubodefowokus.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/2mbfocdnv1i0vlddb4iqi9p6g0/xojetopexopilofojanifa.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/32990163021.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/21902108811.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/55191897054.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/46018963583.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/96591107029.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/37124384300.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/1497514918.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a796e287635---ruzazufovosagep.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba066b1347---pepatogetogezonis.pdfIn PDF document text
    • https://dm288.com/slicice/file/buvutotolemumib.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/3291805462.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/lobutigeporijopilotase.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160888579dbd11---75061776218.pdfIn PDF document text
    • http://onlineexpert.in/userfiles/file/37911855034.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/cb6479c9cb55f5aaaacacb4abb72a04c/lebezejoginegubosix.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/4b4803631339a4dfb13355c13573d74c/5061861677.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/21071103523.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/59b94d47d102d5953aae354063b809af/69917307751.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/99243544297.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_off0000d658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD658 11032 bytes
SHA-256: 8bdf554265080e4d7e8ddf8f394df7c4326783a73b3255999aaf94f6e2fd09f6
font_01_sfnt_off0000f019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF019 17972 bytes
SHA-256: 5a130681401998b520c3e59a78217a6d803b1ecfa09d8f62d8787b9b3b06ecb9
font_02_sfnt_off00011ecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1