Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ec9f49661dd2b5e…

MALICIOUS

PDF

71.2 KB Created: 2021-06-08 07:25:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 889da9b20b191917d353a9b707a9f9f2 SHA-1: 043f6417629787d2fdd2669c8de9c7c3cbe9269f SHA-256: 6ec9f49661dd2b5e905367f465fc9738682b3775439e7f6633ca76e76a2a8399
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites and other domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of external URIs and the overall structure point towards the document serving as a lure to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pixomot.ru/uplcv?utm_term=english+vocabulary+exercises+for+grade+6
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/5q897nuvptr5h9alkj8b7r4p5r/pugowuligifoxudon.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1t8353te0vg5i0eh0lj91g7sb1/62361120693.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/69b1ca73572af961da8099ac30f0fc84/88685165885.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bff3d0aaa8---61710628012.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/76dfbb9ef786847c9d9ecaa6e62b5151/fubige.pdf
    • https://parokisantolukas.org/Uploads/userfiles/files/vejuwemolazutizotan.pdf
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/gtp83ai2dhivhcd7jfcg5onoou/86651130842.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7d0c460a2---99717255304.pdf
    • http://findmecakes.com/userfiles/files/72730106803.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d443f0bc2e---kifuzuvaferuri.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/cbca5ee60c225639917998c0cd4c7fc5/judiwibutipo.pdf
    • https://binarbaidservices.com/public_html/userfiles/file/87672141843.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/aj653vi7fem9ls5jc1b3c65sm0/59471415600.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df1f06bd54---kozudexavaja.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab6e6c7255---pasokibujusixuburage.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/1093cc3d5fe1399c43b2b2782f29fd2d/pukokoxi.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_off0000d76a.bin
3fd5e775653aad6d7b9e227724b4ef76124d427b877acee2c76fe6847077beca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD76A 5764 bytes
font_01_sfnt_off0000eb1f.bin
eb38c1c2c512b395ce832d203a6fed92f199df4750f6902b5641430b0a6f7264		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1F 10368 bytes

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