Malicious PDF — malware analysis report

Static analysis result for SHA-256 14cf9375e4cc0b44…

MALICIOUS

PDF

140.0 KB Created: 2021-08-02 12:13:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fd4e1c7fde70d62bdd46ce3fd2ebfdc5 SHA-1: a327412844ba3ff91c575c363f306fd772a9c106 SHA-256: 14cf9375e4cc0b4491c4a07862e0881f33cdf46f71ef33456546884a1bbad32e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the presence of many external links indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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://catamma.ru/uplcv?utm_term=ogata+control+system+pdf+download PDF link annotation
    • http://tc-antey.ru/uploads/files/22321109748.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/66447133562.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7129d846b---25627420182.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/77222962828.pdfIn PDF document text
    • http://kfbi.ru/content/file/67359044262.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/ut53jfb93piu9gqj6aaajlgmpg/30181620270.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1608d124ee0f34---mepedoxadikudijadegoze.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16095a0884c009---galimubusaxizusejikoda.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/nolajomarokidux.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160948448e4558---rinebafusozanelovov.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608355c648732---80425839717.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e21c1227aea---fabafumuxodivar.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/jd67bvkb5qqlek5fvd0c3jo03i/59658445917.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/42111655959.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/15383163975.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160e572496ea5b---fidebomidigomitaziliratu.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/mazotuveniwekad.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/xepekejusa.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160af23d0aaae0---56901295713.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608369cc9222e---fuzewoxixedudugewitatem.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/11172786219.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/710aacfa4ea9eee9a98c9e658f564a5f/83483034630.pdfIn PDF document text
    • http://asfcursillo.com/clients/879797/File/vujikozireriliripe.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e937cb41e53---57951608373.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B47D 19024 bytes
SHA-256: 612c3dc42292e62aaf99c8e63d005c3df2093dde330b34b09f5da9fcd4054f54
font_01_sfnt_off0001e621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E621 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001fe2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FE2E 2204 bytes
SHA-256: 6c71c0e99ab3b9d9ad936479e67d8054777c31191e1f0e1e0337601dfd15b471
font_03_sfnt_off000207dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x207DC 11096 bytes
SHA-256: 3f234375b6c516da9eec1baefbc8e43428e1f09b79181170fb9fd085620545ef

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