Malicious PDF — malware analysis report

Static analysis result for SHA-256 3895a37cbbf36dab…

MALICIOUS

PDF

91.9 KB Created: 2021-07-18 19:17:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b5b6c56ba607608c640a5acf30d7d9b5 SHA-1: f4bcfa39276d3d6c2e237fb440279997f37e5d87 SHA-256: 3895a37cbbf36dabdb0e9d28cf16f8ee0f0261d5624447b475172a644cd2f80e
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b76a38c1a40---71238438570.pdf In PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/40916086066.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/potorasotosupekevuja.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6534bfe36---zakit.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/d16bb2aea85e5aa1610709ce11d4b546/8781621381.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/dgb379c029uvei1eo7jujkddl9/bokasukenowo.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/vunuropu.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/297c0130910d8c76e793d9eb93199574/58318734826.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/qnop3rde915r6esb10gofehb15/13489809844.pdfIn PDF document text
    • https://kompaspt2.com/contents//files/18591190503.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/3v0u2lrn1ju1a2pt2q53s71rf4/tewabevinizepesa.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/447b78462b40f7a066736f777441e54b/sutowitolopetedozaripo.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/20990925152.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/45194006036.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/bqlcn12dfhldlc471bahdj4ro6/16456082708.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/b42b8bb11e454ed9844c7030604471ac/90744912934.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/775184fd52e1ff8b67e57685165128b0/liburefofebirikigukowe.pdfIn PDF document text
    • http://aifamilyreunion.com/clients/59202/File/gefolozomikoduzovelako.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/26kfnpfatulhponjo5m81g9dmf/2351022215.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/10a1527bd9e3cf09b57d2bbff174741f/76909843369.pdfIn PDF document text
    • http://mlkscholarshipsmilwaukee.org/clients/f/f0/f021f13c5c598389be7e913a1ae626ff/File/bupibupujazegojuxufax.pdfIn PDF document text
    • http://budka39.ru/files/50476681136.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/balifonerezexafema.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608db06ebede7---27714514238.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=physics+8th+edition+cutnell+and+johnson+pdfPDF 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_off0000ffb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB7 18288 bytes
SHA-256: 55af780a617538bc5e6d6420d8331b2239c76ed4d250a61bb113e2c011986cf6
font_01_sfnt_off00013031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13031 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14848 11172 bytes
SHA-256: ef97c78ebb46e0d44a1357a3ef1c6d09c1ef58da34379701b6d49e93dfc13057

Open this report in the interactive analyzer, or submit your own file for analysis.