Malicious PDF — malware analysis report

Static analysis result for SHA-256 395a7aa1fa495829…

MALICIOUS

PDF

80.7 KB Created: 2021-06-27 13:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 43ee45505e08a0cf0d69a803c7b5b2e8 SHA-1: e3c60903e500829d388136ad16f571ccb15f3b76 SHA-256: 395a7aa1fa495829739fe3e401472b9313aa174b1fced8166c49805834604a93
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, which are likely used to host phishing content or distribute further malware. The presence of multiple links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the true destination and potentially track user engagement with malicious lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/60fc4152b4edddf20fc83e78ed755e92/mudujuxezevaweterijuj.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac142168a83---75351460561.pdf
    • https://economiadecomunion.net/ckfinder/userfiles/files/83650917753.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/950e1c445ab5f750a7636dbc5d6d6f8f/ximudadizulewabodisemi.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/vu3r8ssq4cr6o7uedgmhqhhbj7/90885031905.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/v8jprs31rskgvna6cuaqilt0rb/kigame.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/8pdgrna4meksfeti6slb80723h/65518737679.pdf
    • http://bettynblue.com/upload/fck_img/20210620/file/63626333615.pdf
    • http://gaongonmaiphuong.vn/webroot/img/files/8245675888.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f2c490d9e---zanavapozaf.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/d15189157764eb1727ffa26220b42215/34108426822.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609185f417b56---98954111079.pdf
    • http://www.allatpatikapecs.hu/images/file/bifijed.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160770d82f10de---rugaxofutuvawaxasa.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760921a11cc---54136180808.pdf
    • http://coming-c.com/userfiles/file/jisokujidolusefu.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb3ee4b582---40391778753.pdf
    • https://holocaustresearch.pl/nowy/photo/file/webololuxufolepigijemoxo.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac726b074a0---vipapupemulurij.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d60294b87---ripugiwugifiv.pdf
    • http://sacoorhealth.pt/site/upload/file/vimunezet.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6b6f303e1---81854102968.pdf
    • http://villa-carlshorst.de/sites/default/files/file/59683368969.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=what+does+pst+mean
    • 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_off0000d851.bin
e73c7fef57398fddf386f4b5ee5d3cb706d6de609b54264b4d1feef2ad3a4003
pdf-font-stream PDF embedded font (sfnt) at offset 0xD851 17612 bytes
font_01_sfnt_off0001067b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1067B 16792 bytes
font_02_sfnt_off00011e92.bin
b4095341dade0f5a408efac6e15896574442a54a0d432cf5570768bc8b6c7b0e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E92 10412 bytes