Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dd3a35ee77928c0…

MALICIOUS

PDF

84.3 KB Created: 2021-09-07 01:28:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 598a4bbd27435813828247647fff3331 SHA-1: 021673e6e2a17e83d6df0c547204389440b42b24 SHA-256: 8dd3a35ee77928c02e77fcaa798e432130d967655b5e271589bc90706724998d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/dl3c9hkkmel3qvu4g34hq9opci/banujorabuzopene.pdf In PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/3d6a4086263cb3b777f01980ee61355e/91708899837.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/024ed3c2f624b6c13086e737d19a4fec/71837886421.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/29218934340.pdfIn PDF document text
    • http://preserveproperties.com/userfiles/files/xarulonogituroza.pdfIn PDF document text
    • https://pasarantogel2.com/contents//files/56010085176.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/ugui99ejpldkb86d6ci961qth2/volulotirubibibemoxebe.pdfIn PDF document text
    • http://thecreditcrisis.net/clients/73966/File/69537359657.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082c1305852f---regeneminojumeluvu.pdfIn PDF document text
    • http://proxima-design.cz/files/file/jugax.pdfIn PDF document text
    • http://wawa757.com/uploads/files/lafawokeratixiwunifazilir.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/badotisekelalerodufivu.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e420d0a3a---60973457687.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210612_8A10F6B1BCD348D6.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160784066309f4---44990729442.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160a01fa5244f8---52106159750.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/d3b1a5f31c07e8288605e69d4929f782/jusunuxaxevuziloxe.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/12199492514.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3fb3de704---70398079996.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/73428788824.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/66501945592.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/68165041661.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/99237326573.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/80868354948.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161346ce095956---rajofuwenulijobuda.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/90788500195.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=%C4%87wiczenia+na+odcinek+l%C4%99d%C5%BAwiowy+kr%C4%99gos%C5%82upa+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_off0000e023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE023 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF835 18304 bytes
SHA-256: 68645d19cea054697bb812fc5746218f3b1618176d8b90ee4c3cdb9b588f5072
font_02_sfnt_off000125a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A7 11556 bytes
SHA-256: 093e072b291d63210e371a4b1c2d53ce450b28f3d5b55efb3085716b48ea67a3