Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe85dc60746c339f…

MALICIOUS

PDF

89.9 KB Created: 2021-08-30 10:13:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 86578f4d1d18b55c5547e89eb355a5f7 SHA-1: 223452e4ebdeedb34a59c472e6411eabfea41302 SHA-256: fe85dc60746c339f3d9d4857186d0843fdade91c91cef6c7465e8cee8c799b91
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, which is a common tactic for phishing or malware distribution. The embedded URLs, such as http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a716db21ff4---gorobokojixuxukiro.pdf, are key indicators of this malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/l78ve3b6gnvanp00q87nrrrfj4/kebozuzujopegaramixax.pdf In PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a716db21ff4---gorobokojixuxukiro.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/lotezigufobexakogufibuz.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d38105c2aca---nenapofomujujiwine.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/pidewopexuwerafonopum.pdfIn PDF document text
    • https://viettrungson.com/media//Files/35806895821.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/15586465696.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/29579943736.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087b018986fe---65100428075.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/6c18a5872fb70337da146ebdc877fc7d/vuwetedixo.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/par8eo1jvgah1l2sscdc7pcgo7/jomabikimawexatagexowe.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607435c9615d6---51248594648.pdfIn PDF document text
    • http://dakmet.pl/upload/vigidesuge.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/33669783989.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d62c85f3b---dokerofekezisiruvos.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/fcac416a53e849485d3764f03c91c507/83301522092.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/kezufekubovito.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607ce4d3c84a8---nojixelefuxevov.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b558136cdf3---rivipazefilosuluzudaxate.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/70b7ec671d9b8058936ebfc7ad1452e8/lagij.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/27394917354.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/kevax.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/0418cea61a650192fd03b75672190743/16400074288.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/supobebajuwekubuse.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/jdljm7c37ncd7oq9bbu432i9b6/63178579889.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=the+mystery+of+the+lighthouse+keepersPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113ED 10808 bytes
SHA-256: 8711199738291a7e0358c74e045dfc5f9707a919ad8c4fe6090d4ad94cdafd21
font_02_sfnt_off00012ce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE1 17600 bytes
SHA-256: 10ed0c6469eddf2bd2d10c2c4a5188b435fba849e6597f398df19e1af70f5711