Malicious PDF — malware analysis report

Static analysis result for SHA-256 3304f2fe45bd52c2…

MALICIOUS

PDF

101.1 KB Created: 2021-09-07 13:18:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 706659f9f6f5429c8ff4fe43e3227333 SHA-1: 85192b4f8c85c727e1755a81250702ff82f512a6 SHA-256: 3304f2fe45bd52c2ad3d31201ed9eac0dccb812457d9f13d1411bb6d3214ab62
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains embedded JavaScript and numerous external URIs pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving redirection to malicious content or further payload delivery. The presence of embedded JavaScript suggests an attempt to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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 https://crysiq.ru/uplcv?utm_term=sama+veda+pdf+in+marathi PDF link annotation
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/nqgr5rogc4hrvhnlc0skm8rb5c/19409738911.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/31386058876.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e889349386---11126674464.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612cf93f88685---jojidefowevakejijem.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/4168107587.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/nogosijemarupimagofa.pdfIn PDF document text
    • http://www.siposferenc.hu/html/71042384315.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/98539537821.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3d2f1fcf1---sigovuzakowi.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1610d35a6673ef---91804994344.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210517234835.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/64061041444.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160709cb672b66---niwisudo.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/kovuxebawuwedusalobofo.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/bomegilowamupowasu.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075156d1d498---liduxurixodagamad.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094325de4d71---38671909384.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/buzuxosoranisoxudewajogad.pdfIn PDF document text
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/posunaremenafisalate.pdfIn PDF document text
    • http://westleyden72reunion.com/clients/4/46/469dc9162705cbff2d1fbe132f144f37/File/53752707860.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/jasodov.pdfIn 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_off00011c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8F 25104 bytes
SHA-256: 3def64bf28e1235317f49c3df6ec8d5f0b3f38a5ac432f0aad01e36e1e9c6e6d
font_01_sfnt_off00015e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17647 10568 bytes
SHA-256: b1a63c5a5fd08b3e59483361d22922795adaa0e7b1918ea385f0ec7efe1bf461