Malicious PDF — malware analysis report

Static analysis result for SHA-256 87172e462e2cb8e1…

MALICIOUS

PDF

105.4 KB Created: 2021-08-10 14:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b05dca97fb7271f4eaf30339eb415562 SHA-1: 10776d5491b10342c1ca3a6ad07c147cf149a5aa SHA-256: 87172e462e2cb8e1d37224f0c0628b1053f0cdb61662c1a25db97602e22b5fb8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The primary attack pattern involves luring users to these compromised sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://apoiotelecom.com/imagens/img_fckeditor/file/69499740771.pdf In PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c9dd6b9ccc0---40799953889.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/2889588787.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/usndmm55umrs31u7sb4ja6sm2t/98882726951.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/pegujadowowewadototewosa.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/17776122187.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/ravojepe.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cd7e60eca79---47785750907.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/42893415765.pdfIn PDF document text
    • http://blueyee.com/upload/file/17000513846.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/zenopukuzasodurezij.pdfIn PDF document text
    • http://seja.lv/assets/ckfinder/core/connector/php/uploads/files/punozusog.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/sexavatajusopawetasivi.pdfIn PDF document text
    • http://atek-ent.com/upload/file/91674697258.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/c90a250cad9f95ef6fc2cd9d5a423e85/8818618232.pdfIn PDF document text
    • http://contua.org/userfiles/file/wozasaveza.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160d5daeb116bc---biposebogolatoloza.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/6410439f50b0ddd50dd0339b06d372e9/kinaxolururajapebu.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/duboked.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/75038522341.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/12348b28bdca03f3526a58789133946b/77453820790.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/l6c56vkjrulfg7rb93jq1e1cfo/19508984499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=the+book+of+st+cyprianPDF 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_off00013504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13504 19596 bytes
SHA-256: 5125a2b6fe78027bb9b69c3e1ef6d404144249d0939c9f7bf1e5c75cad1c824d
font_01_sfnt_off0001661a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1661A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017e31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E31 10840 bytes
SHA-256: a33ee3bc10cfd44949544fc9e77b0884c9954d2cb80c6b00e71fdb718900dfd9

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