Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec9bb1064fbfdcaf…

MALICIOUS

PDF

90.1 KB Created: 2021-07-23 12:35:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 54db052621e1c5e046c0d5457b04e5df SHA-1: 92ffe36c10be6308e1365b1b69084b0ae4e0119c SHA-256: ec9bb1064fbfdcaf4dc69cbdbd2fe20ec933c0852d14e703977273f896209962
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and a machine learning model indicated a high probability of maliciousness. It functions as a link farm, directing users to numerous URLs, some of which are hosted on compromised WordPress sites or disposable domains. 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 vehicle for link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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
  • 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://partnyor.az/userfiles/file/xedudubofakegener.pdf In PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/29662563103.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/tikelejudovejojoxujiruj.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/nibufefor.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d787ed575e0---venozu.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/36qpcvletig76ejhont2ljva44/39562789306.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/5ed88264854efeb4d3a56054b544fab1/30363173840.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/bokozetegekazotameruw.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/46884769754.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160d8f8284d18e---dojowakufumuvavodogele.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/katepoz.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aae7719c6d5---xapebaredo.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edd36c74f1d---87907918460.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098315c4bc8e---83639005751.pdfIn PDF document text
    • https://nguyenhungstone.com/uploads/image/files/jonuguz.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fdfd24646---giwel.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/65262243262.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c28da243aba---51955832325.pdfIn PDF document text
    • https://preciseenergygroup.com/media/62695925033.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/35132575997.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070854323dfa---pusezadotozodaz.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/wotovor.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607540872b90b---48607627677.pdfIn PDF document text
    • http://whitebearlakeclassof1970.com/clients/0/05/05755deafc47004aae723e515cf08a6f/File/27463050188.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/11707382025.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/suremusax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=hypersalivation+and+stomach+painPDF 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_off0000fd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6A 10948 bytes
SHA-256: 23c56973998ba5310fbad4db9576bdbb80430743f4cbff486c3d183770453ebe
font_01_sfnt_off00011691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11691 17332 bytes
SHA-256: 7ad9e7326d4ea6f1f4a9962097666f8ef43e1f9d3e7d85518e493717189d06d4
font_02_sfnt_off000143c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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