Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdde2840b1e2f36d…

MALICIOUS

PDF

93.1 KB Created: 2021-06-27 22:42:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7c11fa5090614fc23148dbd65ff0cab3 SHA-1: c78467f9dc28674c07dcc4400c7073cfe3595cbc SHA-256: bdde2840b1e2f36d865eb0d58844e845ec7320bf8acc946ab30f63e24276a1a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a common phishing or downloader pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://queure.ru/uplcv?utm_term=visual+inspection+of+welds+pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/10d13f6eb7fd9aa33393d42be1b3b5f1/7413132505.pdf
    • https://baoholaodong24.com/userfiles/file/rugiwijisi.pdf
    • http://nomaquito-travel.com/editor-images/lupuza.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e29345277---dinex.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d112c4168---54902571519.pdf
    • http://azizolace.cz/images/file/tadulawemenitazurow.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/25246948c62d07c6813b0b656ec57a57/97585648064.pdf
    • http://dh-cell.com/ckfinder/userfiles/files/76152959860.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bd6407957---nonatedexixutatuvubej.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6f638cb41---jibapugavebapolonobubifux.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a42b59ce5---18812529414.pdf
    • http://birzebbugastpetersfc.com/files/file/komisunamekapakorogilixo.pdf
    • https://people11people.com/uploads/File/88389906797.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b68401ba16---8476939695.pdf
    • http://amandatravel.com/userfiles/file/85057555881.pdf
    • http://acpiindia.com/userfiles/file/13017455775.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/96e93f454f5578217217f52cfd314881/95547160708.pdf
    • http://redactron.com/userfiles/file/xugixumufa.pdf
    • http://diysmart.net/userfiles/file/zasutuladapixetelo.pdf
    • https://vivekanandbawwa.com/userfiles/file/gemimawituvaloruw.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e6ff77547---29863571389.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc36d764d80---vevoku.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/b57eb2ba9f22378dfd81608e094c5410/87612946643.pdf
    • http://krukewittfarms.com/userfiles/file/vufukavugavapapu.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_off00010927.bin
5a727509c805c7302f9f4a01f4455387558cc2b1615b4573e1e5c87d1ee7bd16
pdf-font-stream PDF embedded font (sfnt) at offset 0x10927 10668 bytes
font_01_sfnt_off000121c9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x121C9 16792 bytes
font_02_sfnt_off000139db.bin
60b8c160e89bb2080afacfb7eefab9a91c4a469b240410622cf2527e42e2537b
pdf-font-stream PDF embedded font (sfnt) at offset 0x139DB 16856 bytes