Malicious PDF — malware analysis report

Static analysis result for SHA-256 6907434e808f23b7…

MALICIOUS

PDF

94.8 KB Created: 2021-06-13 19:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01b19e615bd3a7ec11af4161c038812d SHA-1: bf3477c4e1b7afc52bb5e3a289162c12806c5448 SHA-256: 6907434e808f23b7490a300f01eb204a64de8312d654e7af3200086089ade6d0
156 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to 'earthquake resistant masonry buildings' to entice users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://laborke.ru/uplcv?utm_term=earthquake+resistant+masonry+buildings
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/b2a7c13bfe93a2784f9fe4fb4d4f24a3/magadavu.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160b584e2217da---20409496647.pdf
    • https://lonnebacka.se/anvandarbilder/126/files/80736428457.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160825c277e9f8---bixopejaji.pdf
    • http://domusanna.it/userfiles/files/31307635442.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606edbc3446cf---pitiguzixosusarigazak.pdf
    • http://www.alfapilates.pl/upload/file/fipuz.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/hvmm3rt14au3kfooh1j55foa06/sopezikojavuxisix.pdf
    • http://hasyo.net/files/file/27491755981.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/7f67fa2404488fc2d70c6db43b87c39b/68256290931.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/683ef9ba9732b20bd3f5ca709a109bb6/82708236350.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/6ac6abeddab5193cc9716fc9e72305bd/sotolesawaziv.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/b23c44135a73a7ba7b03f4d3628c09f9/59899200814.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099198298ba2---golibaretaxin.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/9ff39cbb0e941481f41d86c27aef392c/mepiledenisenowi.pdf
    • https://impactcleaningserviceskc.com/wp-content/plugins/super-forms/uploads/php/files/eb7b7869a9be9754fad2ccd2cdc456aa/80498283513.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_off0001362b.bin
8a02ecd086567b92a43d13c2e665d89b47b26a2cabb7cbf674ca150dd67ec069		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1362B 5628 bytes
font_01_sfnt_off00014920.bin
7fbb8afeb4f4d4a9b1371e105dc9483415ad7b3d66ad6cfbf5c938849c576d87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14920 10896 bytes

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