Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b1b3d6dbd729e39…

MALICIOUS

PDF

76.0 KB Created: 2021-09-04 16:02:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9a9343f2abedc7e82ce1772761c25e42 SHA-1: 086f0e212fb64273fdfe4de59434da3e9f57306a SHA-256: 5b1b3d6dbd729e39b70ba9e2c19f504ffe1a5150ec2bb7fb0a080f950399da62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to potentially compromised domains or disposable hosting, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://queure.ru/uplcv?utm_term=liquid+filling+machine+manual PDF link annotation
    • http://azizavacanze.com/userfiles/files/22250871678.pdfIn PDF document text
    • https://silverwayshipping.com/userfiles/file/rosunakal.pdfIn PDF document text
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/jusolopovaputevilojagu.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/sefujefefeninipu.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/34493734170.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/22374702429.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fd2412d24---31212218223.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/99084766558.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/75181835169.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/59111622736.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/8443575963.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160714951389ec---waxakonujolavajefipif.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/a7051111cc0c43cabf4837bdc460f0bf/zalalixifolilopopesexegir.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/rigepuzawovo.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/44925596552.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8ba932b3b9---72547655593.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/ropegojenu.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cc72425b2a4---14170862383.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/ba91613d30a6651abb0aacd1eb700058/66008229747.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/tokebenipafozulelunota.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b24f90de497---78128552044.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7e187de6e---lunijizodizatifogolew.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_off0000c854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC854 16592 bytes
SHA-256: a0f88b54f5cddc54da144ca8942212dca3ff2e923d95389c7eba0fbfcef178d7
font_01_sfnt_off0000f325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF325 10640 bytes
SHA-256: cb9b2f503f08e99145c8c719f1e299a738857e99c28b02a7e155fe1f64dae160
font_02_sfnt_off00010ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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