Malicious PDF — malware analysis report

Static analysis result for SHA-256 91b827b60e2ddd96…

MALICIOUS

PDF

106.8 KB Created: 2021-07-05 06:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e87615acd3f78ac0a909441f1ffd337a SHA-1: 08fd5b008140f5bca5800ad18cfb1fce0fb92d21 SHA-256: 91b827b60e2ddd964c3d857d3e61e7bb3e72eddb249ec2fa92d5fec36921b56f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to compromised WordPress upload directories and other disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these external links. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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 http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c83003240---zitunevibozo.pdf In PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/20341650426.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/62037586374.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160785c0b689c8---pumokan.pdfIn PDF document text
    • http://www.toptehnik.si/images/43658023775.pdfIn PDF document text
    • https://avvocatoboretti.it/file/24689198611.pdfIn PDF document text
    • http://kokomo1986.com/clients/31029/File/nukuraz.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160adf133c55d6---21088283562.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/lavawibomeguvigu.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/9pnrkqeabu2l9k6tdvi9s5s5ul/34115084508.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/b7c0705ac790d20f69f7a285f02dc9a1/waxudexataxuwiweloliratu.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/6cd463e5e3df38edffe694675ed6df89/tojuzuxiwer.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca41c22a6b---zopifil.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/5d77c6d8f1d0fc96a25ec225093a6774/42278670928.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d46b3ca87c---62894087924.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091a84fdbdc7---tipifufemepez.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/5c7cef2eb6dce1cde5c21119d7d83219/13484846115.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b61fe72ada6---demegofozizagikopidora.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/2528398302.pdfIn PDF document text
    • https://marmarases.com/upload/ckfinder/files/85439350402.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/82027276456.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/13549716746.pdfIn PDF document text
    • http://vieclamketoan365.com/upload/files/fijedidepeko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=to+be+guiltyPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A9 24180 bytes
SHA-256: cb36d0dc63d52cdc6b32e1007169f8e649ba21cf1b7c37b5adcfbec66d0ffa5d
font_01_sfnt_off00013719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13719 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014f30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F30 10068 bytes
SHA-256: 39253ee1ef41cd48bbb7b4c9865033a010b0815241cc896b9bb75ee53e43a4ed
font_03_sfnt_off000165b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165B1 4060 bytes
SHA-256: faac7bb659f22053d797678056436404ffa95e3f9be65caa1e66299147c0ef7b
font_04_sfnt_off00017568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17568 21596 bytes
SHA-256: 1e3ba2bc745f47e5d49cebc4494d4c07fb9cfdd19ffac694b911f8f6b19d76b5

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