Malicious PDF — malware analysis report

Static analysis result for SHA-256 72f72b214a227554…

MALICIOUS

PDF

84.1 KB Created: 2021-08-21 21:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b105d0c6556c698247796f8b1ad3220b SHA-1: 51c482fd05e8f690df78430110bb0d83805b2c63 SHA-256: 72f72b214a2275547985228903c901d824398d5c0e0578a671c609c6041fe160
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting. The ML classifier strongly indicates maliciousness, and the structure suggests it functions as a link farm. While no scripts were explicitly extracted, the presence of numerous external links and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a likely attempt to manipulate search engine results or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • 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=bohemian+rhapsody+chords+piano+pdf PDF link annotation
    • http://jar-ted.pl/file/14912042221.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210607_A7F67A6972CFB1FB.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/88421478054.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/80382910520.pdfIn PDF document text
    • http://unityproductions.com/upload/files/mumurexutixe.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16078eeacd6b26---63144696466.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b5b68d255---88941503859.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/doniv.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/c495cdfeef6242c331e14bceeb2d32c2/21945446543.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948d6235908---pakit.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/45812411432.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/fuvorebotenida.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/zefugedaruxev.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/9648c2e2d31e4c7cbf584e98fa442aae/muxotizumekojozalokaja.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16094d8218de5c---18827108105.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/33956859763.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdcfc0b1b4---31746345833.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/sipurelavajotit.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/80313259927.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/ff3903ad770850be04546f2d62ae1c0a/60067511494.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/32983769121.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767b6f779ab---noxoxufuzola.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_off0000e279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE279 10908 bytes
SHA-256: 43477516b6770dca312820860cf15d18f9ce4cc33b7aa4f4c270113a3a6871ef
font_01_sfnt_off0000fb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB86 17716 bytes
SHA-256: af92b947fcbe6b28fe52956e5545131c5edbb0fda3f18aea1f89629982e7c94c
font_02_sfnt_off00012987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12987 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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