Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c5df4be958016e5…

MALICIOUS

PDF

80.8 KB Created: 2021-06-15 11:06:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 202579930478dd80f096e116aaa450c3 SHA-1: d21eac50ed77f66b528f0e8235e7afcba312bb41 SHA-256: 0c5df4be958016e5cbc3616161374641bdea6c4686b9945adcc4abfa57858948
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://crewmak.ru/uplcv?utm_term=how+to+find+slime+chunks+xbox+one PDF link annotation
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/nca7lqoc680edcagn8h4fsb2t5/wovepegubapigeguje.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/0o6p7gduoqqqs5bnvufhucin57/mefovidobifuj.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/6358645c444da6374e07fb5c1bf9ca43/segabeninesinorefuwabotim.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcd2f9e04e---42342394700.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/kebuzusuzakokifa.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e13e8a577---fexofafidogumixag.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/da093903f3f234220a0a77e1812dc92c/getunujamimilagidu.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/92357262051.pdfIn PDF document text
    • https://soechi.id/userfiles/file/14787517970.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/4qem5j1f9dkc7t22ertvicr4md/69190574778.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/886a3cdd1cf1d428d1d1c77cf26beed4/32058307683.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/30266712386.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/4280437453.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/femux.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/gajopewak.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/2c1a30aaceb485f4b2a8bf11c9c2d919/tepovalazu.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/nezibudufozazobu.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/88014594965.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC37 5280 bytes
SHA-256: 224414614ae89a97a17dc35927038abfa3efad7c57ad9b242268e2adaaa754b9
font_01_sfnt_off00010e1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1F 12856 bytes
SHA-256: 862975dbd22422261909c9c99258843718f23de825b0da09f35bd917f2cd32c8