Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb0c73728258dcce…

MALICIOUS

PDF

82.1 KB Created: 2021-09-05 23:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 86483934ebc8f4882cad7ed21d396ef9 SHA-1: d77dab6ca4f7cec60e743b761dc8983150ae8a45 SHA-256: eb0c73728258dccefccf2920eb25ceba522fd1432065036c3a06d7c3b51369fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to compromised WordPress sites, indicating it's part of a link farm designed to host malicious content or phishing pages. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these compromised sites. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/nn6j00hien9ku80eddtd6gq4b7/83031952012.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608729ea2e368---83351710589.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/30168974722.pdfIn PDF document text
    • http://veterani-pushkino.ru/userfiles/files/91649204365.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/febab7b1c2d784fd36b0e640e9eb8d9e/97616136566.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/94292109329.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/2qtton8qdadj9u464nrg0q1b89/35368931570.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/jilodujezasolusutil.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/8d41d18c51c74a2c427209384b77f5ba/fekinimulegonenalelabixit.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/32370829395.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/lijadufalaraxadibinefo.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/2c8963952a6e1c6e75d2cdba9e042779/pojolojajavowajedom.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a405c97e1d1---80828855124.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/091024193717.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/gozuve.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/3182727313.pdfIn PDF document text
    • https://autoparkalbanese.it/file/56032446525.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/koninazuzezofuzunafidebit.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/wulojezosixuvi.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/zakesiruwolewitala.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/89175230305.pdfIn PDF document text
    • http://esllearningbydesign.com/app/webroot/files/file/zurinanagufobafamit.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/14c1134d07b40742f475ba60d7da239c/xepevugowepipejazuzalafe.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/6da65faabc92a5924660d6837035d1d5/pizuxugisi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=sbi+po+exam+syllabus+pdf+downloadPDF 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_off0000daa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA1 11076 bytes
SHA-256: e27d876f531418cced3b8dfdec533ec239f1241e95d5c8698c21929ed78eefcb
font_01_sfnt_off0000f43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43E 18120 bytes
SHA-256: 526185a3bfa48bc1227e723dc1195a6b56c542746a16237aefcb27917ecb9c3f
font_02_sfnt_off000122d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1