Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdfc9b8d88c32ddb…

MALICIOUS

PDF

70.5 KB Created: 2021-09-06 08:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2781f00bc39724510bf25cefe936e4ac SHA-1: 7198e0c8cdabe457bb990dade01372bcdc8c9608 SHA-256: bdfc9b8d88c32ddb484f44857c4d7720f797a5722b58be138ad10d0ac8d6646e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute code. The heuristics indicate the presence of external URIs and link farms pointing to compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification, likely involving phishing or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://blueyee.com/upload/file/190350129253.pdf In PDF document text
    • http://coffee33.ru/archive/file/71620391034.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/272565e10a11424b3cf941b45d5459c7/muwijikumojalijavazok.pdfIn PDF document text
    • http://webhenevents.com/clients/868374/File/69743461572.pdfIn PDF document text
    • http://waypl.pl/upload/File/tutazikuzujezarodev.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/5c0c19ab24f3a2f4257082b331e97623/37886728571.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/81950607664.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/r8b6t0ln45emcbb6rc8uf29gk2/sobufugorez.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/zepubasifebemomoji.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/ffob03t7hsfbvhhpq8a5ofl765/21201284187.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/xuvobewefotetutewarubot.pdfIn PDF document text
    • http://tykhestudiodesigns.com/clients/7/73/7311521ca682816632878891c231d107/File/62560917872.pdfIn PDF document text
    • http://sns.hu/_user/file/bomilaxanuzaliso.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/b55b381d975ff919072d798d416a67d7/57379051176.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/53170715852.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/pujimanelinolujadi.pdfIn PDF document text
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/5a4a4c151381bb6ec9f5fb9eb47ddb49/temavekixofasorukodu.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc7a1e9f74---71277087629.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608692e49c13b---begenamizuvo.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/e95c1e6e8f22b6a968ab4c85d7d659e2/98967946503.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/50231449148.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084c0d19cbca---44046236442.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/d294401b1de04631ebe59892fb11aa46/73354413534.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/44888793167.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/27002515330.pdfIn PDF document text
    • https://ultralloy.net/upload/files/54856278140.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=illustrator+print+to+pdf+black+and+whitePDF 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_off0000b718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB718 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2A 14432 bytes
SHA-256: b51e36072bb8b2b7724c9d49b71cd6ce7f2a7de920fc80f16f1f2b72395c6456
font_02_sfnt_off0000f29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29E 11084 bytes
SHA-256: 70faa937de5a643d5a86649f056551690601f0da083bd29b3cd8bb2cbbf1e642

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