Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cef5c50b5985bbf…

MALICIOUS

PDF

84.7 KB Created: 2021-09-07 00:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9e1c40ac8db95add53fd8da38711dd27 SHA-1: 82261e61654401593c36dd31f7ca0121c74a26d4 SHA-256: 5cef5c50b5985bbf546d75b1d3dd4e9f75b8afd4236cb73285bdd790b5db0b6d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cab5a321c48---40154623403.pdf In PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/9e1510f0c9ac25e5c73b657a777b4c09/dofedobijivimu.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/5uk1ivaspeusgpu7qhu6he9bpp/julifefabakusap.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/dukaxejobisalupegul.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/93904646106.pdfIn PDF document text
    • https://akvaguru.hu/user/file/jovejuwuvag.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/ek5k6jmono55fib959l3nc5270/loruwupegavaben.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/4c7de279166e1661f4bd3a2e81e9fddf/69329043991.pdfIn PDF document text
    • https://klairtransport.com/uploads/files/3136731908.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/sakelivobukuritagux.pdfIn PDF document text
    • https://www.dgaspcsm.ro/ckfinder/userfiles/files/10552944530.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/xukisuxizifeluri.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/30667844037.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16074d3d2931f1---pozedijevomitubabuxa.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/31719421628.pdfIn PDF document text
    • https://mfdesign.hu/files/file/nexijiselovagotenenubanij.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/43848094520.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/12230367017.pdfIn PDF document text
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/vidukukutavukipupufikuwa.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/5v041cn97ls2ii6foifq8l3ned/luzituxobamuxeriguma.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160925bb0cb8ee---kugunirasewigiwi.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9725c78c5---76976993318.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9f8f244a3---49375730831.pdfIn PDF document text
    • http://starsunited.at/upload/files/nunosurope.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/2ceb21ad4121dd6c2b74267c131ac005/duzasasazeterunevoguzeje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=2016+chevy+camaro+ss+manual+reviewPDF 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_off0000e2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD7 11128 bytes
SHA-256: bb71bbefbe3aaea82dfbdf6e691d6bfadaa5ef2ee007efab6f1f592bade99aac
font_02_sfnt_off000114c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C0 18472 bytes
SHA-256: 8bb517aad4d3ed4815f454566d9a2881462bdb0be807dd6c5d04685efc12bfba