Malicious PDF — malware analysis report

Static analysis result for SHA-256 976f5357e866b3bc…

MALICIOUS

PDF

84.8 KB Created: 2021-06-29 08:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f9419dcb14f438c2ddc29d0196361120 SHA-1: f294c4844dfcae00435c6e5adfd8678b5f392eba SHA-256: 976f5357e866b3bca7d4a8d07aad129ca534b2da923ca91f2bb522f1590750d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document functions as a link farm, directing users to download potentially malicious files from compromised WordPress sites. The presence of multiple URLs pointing to file uploads within WordPress plugins, combined with the ML classifier and ClamAV detection, strongly indicates a phishing or malware distribution attempt. The document's structure and embedded links suggest an effort to trick users into downloading software, likely leading to further infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://drafthe.ru/uplcv?utm_term=ms+office+2016+for+mac+free+download+with+crack PDF link annotation
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079cac2007dd---nogali.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/504365756b678d615e775d17ff0e72fb/1290056563.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd12b9eff22---lulezajonobulugivuje.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/7tuc7b6r55s5uqv4e1ino3cff8/62989723215.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b978a300239---20919848761.pdfIn PDF document text
    • http://technocom.pl/editor/file/zozimi.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/2e2904458819edefcbd9c5948a0afafe/zitetev.pdfIn PDF document text
    • https://efnnma.org/files/file/22819808996.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/palekabujuzowegumagazuxa.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/36f8c195d091cac2ea46757edee5d933/sixotabeli.pdfIn PDF document text
    • http://ubest.ru/images/file/73603924458.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160865505ba0bd---44590452509.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a429819d0b0---goxijibasokukomapedateg.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7cdd45d88---zesoviradubijataxef.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/9lkhmbie1hsn394d8k2lm0v3r9/rajagimedopafimizus.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/14497485455.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/82133185741.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/9023d5ed2001d0b0e68bca2abca873ca/34237818485.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/o9h328kg5fe6uidav6sgmvi340/mebizufurodizowakular.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b462985148d---nerifijonunobuvogejasaxo.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/36448831928a04579e5fab95c0123c0d/84692450253.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/48130103464.pdfIn PDF document text
    • 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_off0000e6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E9 16908 bytes
SHA-256: 76787303e6f9a12f6248c794078d502758115fd1d70887d3f94507fe009926d4
font_01_sfnt_off000112d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE8 11372 bytes
SHA-256: 80e505335a8f57eaa4ffaac6b8d799d17adf9fd012b50fb79f2136b9a4993c7f

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