Malicious PDF — malware analysis report

Static analysis result for SHA-256 e88a01e278c08d30…

MALICIOUS

PDF

72.5 KB Created: 2021-07-21 00:21:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2737d141ba6cdd0b263cdb5460ea637f SHA-1: 8e84598e7b5ee11840e33934dbcdf4b49c72ca84 SHA-256: e88a01e278c08d305250368624c6670d07ded9e81f7d7d43ebaa2c19862151b7
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous links suggests an attempt to redirect users to malicious content or phishing pages.

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://vettercycles.ch/userfiles/files/pitimesezemiripif.pdf In PDF document text
    • http://richmediahouse.com/admin/uploads/file/74202061259.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/c4c4tk0b05squ58kqob7870oq3/1255210535.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/55220593.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/43330572466.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/wunakawofavilarev.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/59654213824.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607776259d356---salezomedo.pdfIn PDF document text
    • http://bomtvplus.com/data/board/file/20210604150927.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8b3054fb761c08817b2405e681e0512e/resakovivesuvuboriwidoju.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/92981323714.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16091f66dc3dd2---11223913236.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/mixopegijapuzalonusa.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/jagelobadadigugoru.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/93332875740.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/57805947755.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/47194001865.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/65939038723.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/776bccbea48297ec8797d5d7047d429f/35491693557.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/menirimejupukiboduzok.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ae17e083c---66427560391.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f4c68c77b44---43240201715.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=bootstrap+embed+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_off0000b907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB907 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD119 16848 bytes
SHA-256: e764dacf0d5549232000e071689785480db062cfa460a99fec119aa756a0c822
font_02_sfnt_off0000fcfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFC 10612 bytes
SHA-256: 3e384359cc045b9e0b0c93d8ac50669f4d337b99b5a32ad3a869dbf8dd19b066

Open this report in the interactive analyzer, or submit your own file for analysis.