Malicious PDF — malware analysis report

Static analysis result for SHA-256 20a811e9160c282a…

MALICIOUS

PDF

64.8 KB Created: 2021-06-20 23:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 74985bdec104f9c762c637da739c6e10 SHA-1: e55a1b25aca3e39e285c04890cb648d704d41b04 SHA-256: 20a811e9160c282ac29e000ffcbb154d08a674da49ff66ae067c2fac0e575a3b
156 Risk Score

Malware Insights

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

The sample is a PDF document that masquerades as sociology notes but contains numerous embedded links pointing to compromised WordPress sites and other disposable hosting. These links are likely intended to redirect users to malicious content or download further stages of malware. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with phishing and trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://ketchas.ru/uplcv?utm_term=aditya+mongra+sociology+notes+pdf PDF link annotation
    • https://asiarsolutions.com/userfiles/file/4208809649.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c22f112195---vesesefowokunufawo.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/kimep.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095459f0c48e---novuzowi.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9be3372bc7---72363132168.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/wuruzukifiwelazajenin.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b82f6a33f05---64426312890.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/vewadixabosalu.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160976aa7040c0---sazera.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/dc8ffb46e2f7e7fdecb4e254a0b3c77a/rerevowerimuwadododofe.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/hjqutj17o9o77fjvv390lq5mm5/pofamiwipidenaruwol.pdfIn PDF document text
    • http://omak1968.com/clients/71178/File/21502859430.pdfIn PDF document text
    • http://fitviewer.de/files/file/81113788089.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/r2sohi0mepqdc5jb2927d7s8v0/41798653266.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1BF 5352 bytes
SHA-256: be9a2ad635e9b5e5b1eb0f6a484f89e942bf6793eb3af1a47220ddc0d7769e38
font_01_sfnt_off0000c3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E4 10168 bytes
SHA-256: 419bdc09570aa8fef53a2d28e44e7d3dc9a86ae25ae8e898f350aa2eaf12165d
font_02_sfnt_off0000e689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE689 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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