Malicious PDF — malware analysis report

Static analysis result for SHA-256 b005fdc9c3a5c8a3…

MALICIOUS

PDF

81.0 KB Created: 2021-09-08 07:21:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 93ca1d89367f655c065478e651e6976d SHA-1: 48f8f05bb045b3f5bd09ff1abc2b7d8dde0b934e SHA-256: b005fdc9c3a5c8a3d595562c0de75930e00ada38b3b7ded714fa64a496957a34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of numerous unknown URLs indicates a broad distribution effort, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076a5653b9ef---redukap.pdf In PDF document text
    • http://mastrodibaglio.it/userfiles/files/6893328681.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/1869843095.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/54b9ef8c56c6f8ebb400eaabcebd269e/17378584492.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/16582317414.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/61357af010c5f.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/sudiwareko.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/25920658005.pdfIn PDF document text
    • https://shiphangnhanh.net/uploads/image/files/kajirinapekevagaderew.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/67900490650.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/zupelivatuzoj.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/c68dabd7c0c62bd7f35c0c0a45f429bc/bawaremavim.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///nodedudizonevonigenavitow.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/6504301444.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///36542051912.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/7d034e3385a0c1b92f7236aa87f00b89/67387386339.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/81810818018.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c44d79ddba0---37953137997.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/6afce1c67b88828f37365a87096a59d3/zajixowejewazabipas.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/52108819259.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/79424194757.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/33894620796.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/2kh1bmn157t75955hcm67nota2/tosisujobox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=capital+budgeting+lecture+notes+pdfPDF 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_off0000d60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60C 11064 bytes
SHA-256: 867720d672e6c0064fc31e05b92a2b244f8994972db2021d6bf73a439779af89
font_01_sfnt_off0000ef81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF81 17900 bytes
SHA-256: 07f55faf50e180366ad24eaf9aca40ab9a4063c27b486d4f9210d3dd5d43ba0a
font_02_sfnt_off00011e9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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