Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a45cf8ae366a55e…

MALICIOUS

PDF

70.0 KB Created: 2021-06-18 12:13:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 602d954f6dcd9e4c3532584167634007 SHA-1: 854aceab720e1ce4b8dbb835de55120bbbd98af3 SHA-256: 2a45cf8ae366a55e144a9df352ca8c6af2f6aba7b49557a086e46e5976c86c5b
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous compromised WordPress sites and other disposable hosting, likely intended to distribute malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the nature of the link farm suggests a mechanism for downloading and executing further malicious content.

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://cardion.dk/gfx/fckimages/file/nenuwigamefibenosu.pdf In PDF document text
    • http://augustaelectricalwork.com/editorData/file/rawuwenewafisejifo.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/85814951968.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077cd9d9e6c9---xuruta.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eca4955425---28917584373.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/fd05188d9ade1ea6e843c534425b4772/tekimewunimofuvunarumim.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/96dde9793b4965760b10dbeba3b4c605/34973200577.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86fe1d2430---pedafofejobarawaxubonuro.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/c44f1d229a09c668e1866bfa7b661c12/30943145085.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/f08b8614b5cc580a2a1688efd1f0e0a8/dikilotirofakofix.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/854574660.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/wixojodeg.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/69014379154.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b095c1d42---98552868561.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-3/20210503060704664753.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de58cdab3a---43124688492.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/8fba67cf50c1797222eeea334c03add2/11212959074.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609448f79c66b---61653203262.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/e369cbdeeee9db8af10e61b49f85635b/93499974690.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=pk+song+dj+mp3+downloadPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD117 5580 bytes
SHA-256: f1c1ddf85060bd49c6c17f49c0c8a0fc3ea78bcb8b421e8ca01b75c5b625ab8a
font_01_sfnt_off0000e426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE426 11536 bytes
SHA-256: 2b4b9ecfdede9fe08ad6b1fff3629302aebd687080afb9fc5e39c5b71fcda9c2

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