Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b96a196b8d36ef0…

MALICIOUS

PDF

89.0 KB Created: 2021-06-30 11:28:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 98a6eed52906c24476bce3194ffa7936 SHA-1: d31e07dbfde8835110b5eb0ceb23e4138c498d52 SHA-256: 0b96a196b8d36ef0e819e36b4682a7b7616b4f999942dd96d444dd5fe89800bd
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress installations, likely intended to host phishing pages or malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting an attempt to evade detection. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=st+louis+streetcars PDF link annotation
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/7hvjop5599b5jlums8eoigk1dj/nupenorap.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/jadapaj.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/94t1ob7qfcebc57cfvnian390v/75132532088.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086bea86b9af---61722876315.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/361be2bed6d35d78e9864319ddb2aefc/xexojapagumokirimameniv.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/45358369926.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210607_76B363B95218BAD0.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/8d12c7e7214ea3c026f2d07a2f86adf5/vuwibenubixusalesug.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/ees3iq7c9eqejhhu6d2epdvkaf/18255177821.pdfIn PDF document text
    • https://htchninc.com/d/files/65231742606.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/e7cc49ba5d0a4b77b51d68a271c12cfd/55102383349.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/3721eaa4762723dc22fd5e97487a9627/84895143217.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/50918531070.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/pupokexudula.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/31fue70llcbntr85n7ha8pedjp/87442626567.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/e4d987af8b027326e0acec39bb40c486/12344221379.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/a234a6c284dbfef76e6db77fc4f273ec/5170807033.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609fecc6ed6a6---13171200852.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/94123461182.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af7254dc3a---19780561709.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/sh49pi1q7rg7o36sf0tj24u0p1/vixigedutisoru.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/34595852716.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/jajusasotuv.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/modikoluluvefemi.pdfIn PDF document text
    • 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_off0000f76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76C 10292 bytes
SHA-256: cf14a583bfa2ca551833231c7ce6e7ab423804e7dd48121be8547cfcfa00f1a1
font_01_sfnt_off00010ebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D1 17812 bytes
SHA-256: 63daf0de7ce396f29cccbef49f75ee8fcb2bc11c81c4166e4e279b8e47d35013

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