Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a21976c3db3f42…

MALICIOUS

PDF

72.6 KB Created: 2021-09-04 09:28:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3710163c2c985d3f26ba716a3ac3d22f SHA-1: d5994b70731bd346464d0e305f68466e73baaf52 SHA-256: c1a21976c3db3f42559518de956a2355eaedde75b16ab20d138cc65dee9b59ef
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

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://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/a86ee09ff9b05cc2ec5a438c33c2d2a1/xevetekudewozuwukulalevo.pdf In PDF document text
    • https://alariel.be/userfiles/file/8497359943.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/e778ce0bdcc067f31fedac3348703130/58930254640.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/80906547819.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/mexobumixalojonabegera.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/7294773443.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/25788360332.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/9efj8rtstrep76eqokfdg6m2pg/suguzapuragasupoxinimobe.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a208cab3900---7775905092.pdfIn PDF document text
    • https://euroialinsol.ro/userfiles/file/94544368579.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073c9164d73e---votedasogosozawumi.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608197b01628f---zixolowanuja.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/46435106851.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/62678943673.pdfIn PDF document text
    • http://abnicum.ru/files/file/fijulugoju.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/katiginebazumuku.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/koranibuvuvo.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/pk1093soe0c74i2k661pq66f52/pokenitixofisonatomo.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa1917d0bb---42231220802.pdfIn PDF document text
    • http://angeladaniel.de/uploads/files/5434604490.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a69583bf929---24803439576.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=carbohydrates+structure+and+function+worksheet+answer+keyPDF 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_off0000b963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB963 11092 bytes
SHA-256: 679902c040d5acae46dc01e50164ab7121f8092d9c799ce6ee22d1f69570580d
font_01_sfnt_off0000d354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD354 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB66 16032 bytes
SHA-256: b54ffae59a11b03e88a54e0fb24e6731b5d98571d17241c2c780a7e54f3f6eb4

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