Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c6ca818e7877787…

MALICIOUS

PDF

81.4 KB Created: 2021-06-25 13:16:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fffd65e711a1c1b4d81ca6a6864106b3 SHA-1: 45b566304371811bd7c65dd02a5003965cc84257 SHA-256: 6c6ca818e7877787f819be0d2bb55502868eabe1c843bf84da005d8bba998319
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to compromised websites, suggesting it is part of a phishing campaign to trick users into downloading malicious content. The heuristic 'SE_INVOICE_LURE' indicates a potential payment scam, and the ML classifier strongly flags it as malicious. The presence of embedded URLs and the nature of the heuristics point towards a phishing attack, likely delivered as an attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://smidgel.ru/uplcv?utm_term=lease+deed+format+in+tamil
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608d54f429fdd---xexejofanutiwad.pdf
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/8605317d3c5eef1329598b198911533f/dovibanulazafutusugobumew.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b47584d93---22305080149.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/5fecbed5b4b923c1f5add0d8ce235160/72841570714.pdf
    • http://kryotherapie.net/neu/userfiles/file/sukaberitujawixabujovu.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/v1i2bt1n5cvv14p48md0tjab93/91143656.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcfe91f956---68735819604.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/ek4cjvdh12ht9442o11nu3kdkn/kigaxi.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609041514c812---60924035101.pdf
    • http://akkoryazilim.com/userfiles/file/2672939006.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cad7479bb---dapes.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f73bf134b---15396382603.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7d0f0e4a6---ladasotili.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a83930edeaf---fixixojor.pdf
    • http://retroldn.com/userfiles/file/89019594911.pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcbb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBB 16792 bytes
font_01_sfnt_off0000f4cd.bin
ceaf4d019c0dbb95541cc21a15a32441ae71ac7b9529ee02365b42c13b016e80		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CD 16628 bytes
font_02_sfnt_off00011fe2.bin
35c6216de0bf8a57753da2a1d7b3ee0374fdca3a1b4651d939992529c6a016dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE2 10472 bytes

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