Malicious PDF — malware analysis report

Static analysis result for SHA-256 50788b7ae5923c0d…

MALICIOUS

PDF

94.2 KB Created: 2021-06-26 01:02:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b19cf5294595afb32873bc4bd0e801f7 SHA-1: 53788a1119f9b485debcc780f95ff7b1e8a5ba86 SHA-256: 50788b7ae5923c0d2a9609d42134807eab1d1190758bda48a578b3dd1fd3d527
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous URLs pointing to compromised websites, suggesting it's designed to trick users into downloading malicious files. The 'Remote-support tool lure' heuristic indicates the document's content likely impersonates a legitimate remote support request to facilitate malware delivery. The ClamAV detection and ML classifier further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=ship+of+fools+painting+meaning
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750f3e8903e---furapirowisetawijotixu.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb570d13343---vibekag.pdf
    • https://ebooksweb.net/files/file/3022945226.pdf
    • https://sealordhotels.com/ckfinder/userfiles/files/55033624376.pdf
    • https://irisapp.cn/uploadfiles/fckeditor/20210513/file/16209025892946.pdf
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/6093541ec1d506dd060ea8be3ba01b3e/popisa.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5fc15baf3---10044052578.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609daa23a80ea---58823633385.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609605dc4e4ae---32914429028.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cc235bb59---wiraforufitelorale.pdf
    • http://eksan-ltd.com/userfiles/file/zopub.pdf
    • http://www.alrafeef.com/faisaliya/js/ckfinder/userfiles/files/dovexoxodewelatos.pdf
    • https://kisikana.hr/userfiles/file/zaredaganaga.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ba19026f8---74867418102.pdf
    • http://aliguoriarchitetto.eu/userfiles/files/91868694050.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/lfl6iakktinhqsaq2pdib748rm/11587329147.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b091c3bab---42026181173.pdf
    • http://yummyschool.com/_UploadFile/Images/file/kuligutapuf.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16083ca9e875f1---xeradexamopu.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/ks6cc5e6avee9dc69h4u5spdmf/66151985520.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c88184278---birizexaredusesasanozemu.pdf
    • http://ji-tien.com/userfiles/file/61644416432.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/ddd3389b2c5f50b393fa2aa658d07454/tewuxibetabi.pdf
    • https://mokhalasati.com/userfiles/files/zurawajumijen.pdf
    • https://securityguardsupply.org/php/uploads/file/gidamoxoseluluzip.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3f43db9b4---zuguxagexirapoxidimidid.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f79d.bin
d8a68b07bc7f3dba07e508b44a23e213603e41c5b3b723a664eb2a0c10299227		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF79D 16604 bytes
font_01_sfnt_off0001226a.bin
7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1226A 16312 bytes
font_02_sfnt_off00013875.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13875 16792 bytes
font_03_sfnt_off0001508c.bin
bb2e671d3b18d82d1501ab6e04c3a1a5aad095507d887f955ce62c128ad16188		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1508C 10780 bytes

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