Malicious PDF — malware analysis report

Static analysis result for SHA-256 194ba4b76e6bf5a1…

MALICIOUS

PDF

143.9 KB Created: 2021-08-15 12:41:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: cb6306ccac8b4c2b595db024967d7323 SHA-1: 9fe0a71c984f83443111cb17c61c74a917c91fbd SHA-256: 194ba4b76e6bf5a19f16950e1e409e89998c56d3153c95fd5bc660e18b851b7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9246

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.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a652c7c6e2c---17200055971.pdf In PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/cd8f8dfc56d68a29e727c04b21cd5c36/saxibuverozomug.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/50778332227.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/43245111365.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/ea360c772c00ebe4d13fce2773527263/31655132905.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160efe9c7ca0e1---miwitipodipejisufo.pdfIn PDF document text
    • http://a-pro-peau.fr/userfiles/file/jufivavukalibak.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16073ecb86dc9a---7811756218.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/40267915934.pdfIn PDF document text
    • http://bethanybaptistcolumbus.org/clients/75549/File/4697891432.pdfIn PDF document text
    • http://okulsanmalatya.com/imgup/file/sidiwarijojosetutub.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/91202663091.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b143f151b95---zuraroraxebiti.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/7de63695238e4710b3837ab2f8afca69/94520075137.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/22cbd8e6c44fc1434d9ca5645457dca4/vowixowodetukawewazep.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/94572271020.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/91927052074.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/94482572580.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/41716894239.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a235371a9---rabuvurowinigodofisezo.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/fanugow.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/d2q6phk6c8k3g4vbgi0gq9spcu/66924591092.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dd9f6d397---jidixubi.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/msi6lisgi04uplqeeh8hhbkvd1/lagipetifum.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e700063e32---tunobizodawufapu.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/90903330925.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=the+comprehensible+classroom+answer+key+spanishPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B85C 16344 bytes
SHA-256: 5cd8a120e106fc2d4fc1855603a636a3ce922decfb1b4d98f17a4a5450337c58
font_01_sfnt_off0001ce55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CE55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001e667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E667 19412 bytes
SHA-256: c7947bd4b558fe2f73caa3e9423eb2cd060c60e011b8dda096fa4ba2601a9660
font_03_sfnt_off000217fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x217FC 10936 bytes
SHA-256: 6b14055959f2410b1542efb977a93af7209aa64f0a05b69edfe368597a77d9a5