Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf7e10bf729355a1…

MALICIOUS

PDF

82.3 KB Created: 2021-09-01 21:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a319a89b86779470319e142a744bbdfe SHA-1: 914e28b0d109fa8149d653c4150895b77300a29e SHA-256: cf7e10bf729355a1d427020c535a127745f6f1421aeb7d7ee2203116e6da7264
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. The embedded JavaScript likely facilitates the redirection to these external sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=biology+chapter+9+study+guide+answers PDF link annotation
    • http://isotech.si/uporabnik/file/wugup.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/fojoluzuwiwub.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/87031956010.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/musidasew.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1clikpri3adk25ndgl1q5m0g77/loxawowuvanajuba.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/41561723097.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160884b729cddf---waxomufezazemovizumub.pdfIn PDF document text
    • https://bbdirect.com/ckfinder/userfiles/files/zupixoxarejamoritin.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/wogasalokige.pdfIn PDF document text
    • http://getvisa.ru/images/File/30205938448.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c64c5b92ad6---9315982926.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/40094236726.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/72506651465.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/8635ea7541fd995e94a26493fee3e4b2/53464817345.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1606da402a4814---97340347520.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/b6dab7c97a03b7f465b8c5c8fa4e42dc/kovuvokukuponuzija.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/54573799478.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/31668296026.pdfIn PDF document text
    • http://secretinvitation.net/images/files/65507549461.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/gunikilijivig.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/9316851119.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26334668855.pdfIn PDF document text
    • http://clase86marista.com/clients/25276/File/29933635098.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0c48dac7c---92267656900.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b039f4b45db---fotimurasufujuxijit.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_off0000dcae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C0 16696 bytes
SHA-256: 0d450ffc8ef8c188d3fc2d7f91a8905a4af055783e3f5e92929b1bfa4eca1553
font_02_sfnt_off0001202b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202B 11312 bytes
SHA-256: c2e09d6e8c61888d7dc2276052ed33d196b8e7260b7792ef59277e31a4858d54

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