Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbd366a5cd8a6e8f…

MALICIOUS

PDF

78.3 KB Created: 2021-09-08 00:05:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4e8c8dc07f1f1fc982beaaff3408935e SHA-1: f72bc1d881f5518f35a0aa326d1f1205c7bc3d77 SHA-256: bbd366a5cd8a6e8f9697d20cc8e81f20f7c8a0408c0588938dd9af68ec8962ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised websites or disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://infrive.ru/uplcv?utm_term=troublesome+words+worksheet+6th+grade PDF link annotation
    • http://zoekidsworld.com/userfiles/file/wixotexoveromisedepamipu.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/28887966328.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/10668084278.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/92845173911.pdfIn PDF document text
    • http://familiegravesen.dk/userfiles/file/29638559894.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/89512002975.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877afbbf3be---roxegorawuvaz.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/miwigorixo.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/bob602n7am9fode8niq4su2ih3/81268489248.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/331fbb6158e48f12bc8ac5baf35f02ff/24765617652.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/92228985822.pdfIn PDF document text
    • https://kasihpaham.com/contents//files/84807806523.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/5b302ddca8b1c6d53f9bd542860a9ee7/mivufetavozaligowimut.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610fd3a80374a---pugobidazizoxomisowemuma.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608129e0bc6b2---mijewipipeziludonegimarun.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/dososomoxuwogijazuvin.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/e1b305f490508fb33fcd6b8e92343216/bumib.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/96687650626.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f00d1c5d5bf---25133512804.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/fusavebizinujiliraberiw.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/mku9cnm3nlrkgnqh9kl755rp11/fapedagal.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_off0000cf13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF13 16652 bytes
SHA-256: 0bdfafe002d26951f75b6de4b1185b9b73b233a9d458b72b0e637298609d70a3
font_01_sfnt_off0000f9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EA 11048 bytes
SHA-256: 58fc42983609ce0dbedf5b28411a02584bc90adaf53bb0c0274486b083799b28
font_02_sfnt_off0001139b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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