Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bfd4873d20e6f06…

MALICIOUS

PDF

83.5 KB Created: 2021-07-01 11:02:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2d31ca3a48dd5073435e4131b7ce5b04 SHA-1: 95fcf52ab0c9f17641e9e09ae0702837f2317dfc SHA-256: 9bfd4873d20e6f0688a71636cc855b3fa5c6d0de62f66eb5b11a013183c916b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing users to numerous URLs, many of which are hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://oxi-dental.ro/imagini_ws/39585876388.pdf In PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/0fd3e02724d781b98e7d64f0fb27cde6/20805718813.pdfIn PDF document text
    • https://coevent.ru/upload/files/jilebulanejagezawuvesibe.pdfIn PDF document text
    • http://topcudental.com/img/userfiles/files/mebukapalavemuwogakoxepo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb95ed2d4b1---jevokuxad.pdfIn PDF document text
    • http://sdds.be/userfiles/file/96524140622.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/rduium8fdu2nsot3mba1omf9i2/kezoma.pdfIn PDF document text
    • http://cortabellanews.com/userimages/5091937960.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/sfif1cfjs0jlho983u4rn5d1ga/tosesekofasiz.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/ro58db8baoh7dbfniam2c4o2mj/felewapovisalogupifem.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/96293649144.pdfIn PDF document text
    • http://aps-mes.com/files/file/37334531274.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/dofilejulilumekupepoje.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/83695004892.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/a6fbbd0b0fa3a9b905c217c727787fb2/92764758647.pdfIn PDF document text
    • http://bellsazshihtzu.com/clients/878694/File/saxavawofuka.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/nuwugulol.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/esed6151s3v2dd9uugeqal253v/pabowubazuk.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/zilodebim.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/80153020564.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/f96758db4f40f52967d88ead2a639d98/sakepilaras.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/69953311034.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a7dce47afad---6889458608.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/fovisod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+change+pdf+background+color+to+white+for+printing+onlinePDF 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_off0000e0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E3 17428 bytes
SHA-256: 4f02964eb0786c91e4362be1e18b0002ae112302d995e2d95399f7044b80a20b
font_02_sfnt_off000126a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A5 11140 bytes
SHA-256: 4a392066a7204b8c02dcb2a74d22bff6906e8dbf1dde1e94f074b9cb28a05657

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