Malicious PDF — malware analysis report

Static analysis result for SHA-256 00ccbff4a82ddf09…

MALICIOUS

PDF

99.0 KB Created: 2021-09-03 20:32:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2d509c4ea85566ff67d105233013caf8 SHA-1: 975c6021b51eecabcde3bf4d3bc663c41b0ecb3e SHA-256: 00ccbff4a82ddf09fb91cf7819d1a7239033f46637b59c7221f212ebbed05abb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the links and the 'link farm' heuristics suggest a mechanism for redirecting users to malicious sites, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/aii1vqt31bmjh8ekcbrlk0mkej/bomijopivaxamuzu.pdf In PDF document text
    • http://stjconsulting.it/userfiles/files/nunamopega.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/94197033925.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/dd4h5en8cbtgih160onehcij0o/85761595036.pdfIn PDF document text
    • http://smclassof57.org/clients/34860/File/lurajeb.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16071de70a7c9f---xenimomuvuvebeboj.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c78c5ac88b---26231344199.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/21403322858.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098100f2f4e1---zitivosew.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///29271628705.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075b8f03909f---94434902671.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/62345828713.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/2cd536c7719919bc1524463d90c7e0d9/kijas.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/bibatonisoj.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/gojerilixuxakidudaso.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608443804d012---parapijirezovitatafo.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/8f0915e50c347210847a933e03c73454/gemisis.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/27079348353.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/sadamutukubixuwam.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/bf5d405242fff9aad5cfe8f296f047ea/71432433857.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c445b8971c9---40078063223.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/4892671482.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/sepelitonifosowavevovojad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=netherlands+tourist+map+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_off00011977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11977 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13189 19736 bytes
SHA-256: 87e31bd83b83c8ba2b3980a61d46fc7d03900bc5d0ac524e722657a85ebd86e5
font_02_sfnt_off00016579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16579 10840 bytes
SHA-256: 6c8d2b543ea8f2e0b48815c98349052afc6f8d68f353191795227ce680b896d6

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