Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fb6b04c52139f7e…

MALICIOUS

PDF

75.7 KB Created: 2021-09-07 04:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 98e8dc3d183b2c0b9adc08e4a2989435 SHA-1: 869ee929f427aaf907967b4151df47bf26b433cf SHA-256: 5fb6b04c52139f7e9d434b9cac82e1ca13550f72c458526383ac1877924092be
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. The document contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. These links are likely intended to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://nomylo.ru/uplcv?utm_term=ancient+egypt+silverman+pdf PDF link annotation
    • https://drrajanmahtani.com/userfiles/files/muxebepidenekegakuf.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/3255f443cdcd44a934d5500f15786898/makosibe.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210825211354.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607022fe3564a---61135240151.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161292bc8a8045---pifowufulisifume.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16074a94325412---35691336184.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/rikavewenemenuxabunevuz.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/66132284726.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/13266453604.pdfIn PDF document text
    • http://slsnn.ru/content/files/62128197131.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/vefuzewawudafejabigasu.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161121b734e31a---bomebosibejobasejub.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/66991274083.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/kgvgfg3p565bq819oj4ogpt9lv/52471302202.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/gigigopojimewusazuf.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/1da33072c254a0ceecf6d32683bc6d43/30457690050.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/55405769577.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4018a8bed---74602095671.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/e0fac7c199e1fcafc7ef7713379c7e3f/zoxikagum.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14cf098ef0---duligufiromeluxumeda.pdfIn PDF document text
    • http://3dsami.org/uploadfilefiles/44121520714.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/a9dd836876667e329654da441f4f9a91/75361626373.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_off0000c422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC422 17028 bytes
SHA-256: d9d0424d03c455109bc236b9a0664a91c51fe10117813f0f000634ef7921ce02
font_01_sfnt_off0000efd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107ED 11004 bytes
SHA-256: b699f8bc5e67344d9345cea3cfdd654cb9fa946cfec2280f0442b7b878a8e434

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