Malicious PDF — malware analysis report

Static analysis result for SHA-256 56fd045727bd9e7a…

MALICIOUS

PDF

80.7 KB Created: 2021-07-01 10:25:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5e76371a3231b74115805bebc26e65eb SHA-1: 964284eab1ad7ac0885c862306dcddec767d5eaa SHA-256: 56fd045727bd9e7aac2190b7a80ba83d47b8bea84ce32796610ed3f46adba24d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting domains, likely intended to lead users to phishing or malware sites. The document body is heavily obfuscated and contains no readable content, further suggesting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://www.findvoters.com/userfiles/file/sikudiwekusanasotasatak.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/uo73fa8k1gsp59ss8jem21pejd/81405282059.pdf
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105290708198395.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0172807b8---25894768049.pdf
    • https://www.myosiaffiliate.com/199trust/img/file/1672626842.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609d698799bc4---32879971421.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16094d1a068cfb---21384199470.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/1bf453161bf3edf765274525b8eda898/78380056661.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e73b495bf---vuwotabetumijuvog.pdf
    • http://hanhthien.net/uploads/file/wazofabanisidifel.pdf
    • http://campbellelectronics.com/uploads/97614507656.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/9bc03cdd0c6c1f489105bff4ec8cdb9b/2394983406.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/7ed738bb0f7ab762a81ba59426fd5326/66002707727.pdf
    • http://n2nnetworks.com/files/others/90533417956.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c965d8ddd5---gunavogawe.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160be4a8f61a93---677914683.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/b4e13f2be79dfde3d27b94f269b50f5e/nuxakakurowatanumiliwug.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/ra3mje2ipec00u7oj7ailk7kp6/xebodenukegobagudek.pdf
    • http://gillsandgeckos.com/userfiles/file/15768402859.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32a2d95e3a---57271553066.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/a13ddd9dee026d889181a6941227556e/gakesemod.pdf
    • http://arcomproltd.com/userfiles/file/xidumatizatatone.pdf
    • https://bio86.net/fichiers/47681568168.pdf
    • http://hndgyl.com/v15/Upload/file/202166736349343.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/6fef79cee27bca78b1e0293a1f82f2bd/86919937447.pdf
    • http://techniq.ae/admin/uploadfiles/file/2575188004.pdf
    • http://paillasse.hu/userfiles/file/dutufenagijiduwapinomovif.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=final+conditional+lien+waiver
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d80f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD80F 16792 bytes
font_01_sfnt_off0000f021.bin
b45aa68dde72fe1286c47364a4b0ad89c3425a9fad6bbe85611b0c654a98b70b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF021 16912 bytes
font_02_sfnt_off00011c7d.bin
a5d521d61bf569bfb146a098544390be2a40e33e812273f29aa689ce6b9a8e84
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7D 10324 bytes