Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7eea88b22a8b9ac…

MALICIOUS

PDF

80.9 KB Created: 2021-06-12 13:10:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3460b1fd41215647c5e24e88a86d0ce4 SHA-1: 841399c6612917876cd69564b06ed391f712008f SHA-256: c7eea88b22a8b9ac7045065939fbe3c3582d3816a8dc32e752bf69edfc9fe61d
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URLs point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://philabc.ru/uplcv?utm_term=wonder+woman+2017+watch+free+online
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c33bb7a247a---savofomafajex.pdf
    • http://cerescommoditiesltd.com/Images_upload/files/wetewis.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16074af612055f---32363190352.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc90dddf51---1091797897.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/0149a37cea288834e8cc1e4df7b39877/ketom.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd95a8adb1---60968427379.pdf
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/a204ed52a3b71ef86d5578d58fede5ec/zutomiwugazo.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc897e17200---kifup.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160794101a18d2---lavozipajutibisej.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1609a14bc3f6e9---55096001404.pdf
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/7a8085ffce185b2271287ccb2194702a/petomudexizaloj.pdf
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/xuxipalila.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62f55ced5d---99016832005.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5771d58d7---rewubixemomatipetaxiwap.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16084f133d5c09---89028302478.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdbc.bin
7bb0673be111528dc347ea9b2a68c8fea1d2fe346cdadee213856e9aa4a01a94		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBC 5592 bytes
font_01_sfnt_off000110c1.bin
84f14f5ca95ad48fb133c89a2d75b05b8a70b0b4591ba1b71709ef3033963245		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110C1 11132 bytes

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