Malicious PDF — malware analysis report

Static analysis result for SHA-256 c76a3e7f8aeafc53…

MALICIOUS

PDF

70.2 KB Created: 2021-08-10 06:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8c78d981a809ba827f32e747583038cc SHA-1: a7377799299834b2cf0beebcdd315fdd0b17522b SHA-256: c76a3e7f8aeafc53571f57ab1529e8b55c852c998af1cc3c513ec35560a95338
154 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection for a phishing trojan. It contains a link farm pointing to compromised WordPress sites, suggesting an attempt to trick users into downloading further malicious content. The presence of numerous URLs, many hosted on potentially disposable domains or compromised CMS uploads, reinforces the phishing and malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8520

Heuristics 5

  • 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
  • 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://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/59dfcad03326ddfca7d76a133df46e4c/selibivazegopobosuwa.pdf In PDF document text
    • http://textstricker.de/benutzerdateien/6206674605.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/f1317c0c58e520f41ce984c1aaffe74b/zogoto.pdfIn PDF document text
    • http://ned.ru/uploads/files/65409969953.pdfIn PDF document text
    • http://zerosquareonline.com/file/pebeb.pdfIn PDF document text
    • http://pololanna.com/user_img/files/32227341814.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/23708950968.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160930f07cf80b---33068044419.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/b480efabaa47ee373499f54b4ae7b176/vegawadozejorepegeboxoze.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/36395093433.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/nisipukijizazewobo.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/4cf318b3670514db4069c7ed51a1c307/powoluderivoxovig.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1bae28e6c---84209337120.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/v0456agnvb5urcrhvamfhnjau1/46542279486.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/ginosasezevarurajamape.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5cf977b2c---39889672410.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/ff4d775e24e821533efe6baa7c8b5916/49827326558.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/70379057134.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160abe8c4ea128---58074798763.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/31820572239.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c787cc53d71---rasawuzilokudefazepuva.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/xidafusalekabudofe.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/noburipisi.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/59979298576.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/61070874524.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=swiftshader+3.0+dll+download+64+bitPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE545 18736 bytes
SHA-256: 3ff097c2170a793a6e98792d36c9cc2454d2cb072ec6b0170a09d619d6574e11