Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe51b699f3c985af…

MALICIOUS

PDF

75.0 KB Created: 2021-06-20 17:57:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 737f35756f315432687b8cf1413b1361 SHA-1: 37ea57a0ab065eda9f7cb436618da09817cdcd92 SHA-256: fe51b699f3c985af4902b2726855b514f0cc6db4f110e0b0075a9f1d23d08ae1
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of 'utm_term' parameters in some URLs indicates an attempt to track user engagement with these lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/70pp3qma8gmqke2f2jpid856p0/rakuwilerujipaduna.pdf In PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607317b6afc6a---pulojoziz.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/11035725956.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/8027473630.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/48029129308.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/jepadadidasupenivasowuz.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/23912c0329f92c0d5b28bb34cec25807/berafeta.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/61f85a6117b7caa99c8c500699410793/38992566125.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/34447d81adb07f80c5ccba15195cf56c/74556545206.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/99b65271c7eb1a3cc42f9fc18fed4d96/gazajuwapufenavanatexu.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/webimasug.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/wesovosowobepi.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0ae018e69---83220537983.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/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=android+oyun+club+brawl+stars+hackPDF 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_off0000e580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE580 5412 bytes
SHA-256: 8763d75eeed4197576f86e8a046a57580bc1f758b748dc59aeb34ec1938d86b1
font_01_sfnt_off0000f7f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F8 12160 bytes
SHA-256: 6d0a94457f918662af8ba68afab85484a7b5fa100ecd59872c60e537811e6a01

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