Malicious PDF — malware analysis report

Static analysis result for SHA-256 9636f1dd009497d1…

MALICIOUS

PDF

89.1 KB Created: 2021-08-31 04:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 940864b20c17f3f8dc07405fe7657746 SHA-1: 29e37277dec4ba66cc8b6beef30d7f69d0323b8f SHA-256: 9636f1dd009497d15345cbecc507e5801817eb37874f6845937f6764f1f9438e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains a link farm pointing to compromised WordPress sites, likely intended to trick users into downloading further malicious content. The presence of external URIs and a link farm on potentially compromised infrastructure strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607907900b990---78201550440.pdf In PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/pepilabi.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/mawojoken.pdfIn PDF document text
    • http://ed-union05.ru/files/file/wepagogapumegabodarix.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/jlvi5ogsdtfj39qvojc3d6hhf2/pazide.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d365b7ed923---lapozuvekuvoni.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/buzitiduzigoxukawobu.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16076a3da9a560---69031525153.pdfIn PDF document text
    • http://lucann.com/Upload/file/18218001351.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/46000136390.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/sizumolufud.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610af991e415e---43708476664.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/d999697bc3281e4a6b27ac16c838b429/70044938497.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077cb9ccbe03---31235224815.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/ab69774a0b1bb12a5c807b341f43555a/jajunuwilokirisola.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/607d3fe058a433aeb575e7ccab45c225/34983842040.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/dafapovi.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a5063f7e48244f13267f86f224e03101/78298900710.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160fd5c0f58380---55197937145.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/50881763512.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7430e3a7a---15875339774.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/vekevobupizu.pdfIn PDF document text
    • https://yuss.it/file/gufizivatetixinobanedema.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/7f4da230aae104047eef6cd93a403e4d/94153135406.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/589ef732a4497ea561779d384cce3c08/gitegugikaba.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/40532697467.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/72295495479.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=activator+office+2010+kmspicoPDF 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_off0000da74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA74 10924 bytes
SHA-256: 8768d4f805b1d325e26709b32c8f04f8ca27448beb1b3aadaa472ab6063ab0cf
font_01_sfnt_off0000f3ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FF 20240 bytes
SHA-256: c7e9a1a6e234f424b33d87b532121cef7784e16a92955fe89b819990ee3127b8
font_02_sfnt_off0001278c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278C 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d
font_03_sfnt_off00013d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1