Malicious PDF — malware analysis report

Static analysis result for SHA-256 51af680a71a385a9…

MALICIOUS

PDF

79.6 KB Created: 2021-08-19 07:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d55ce34366f55f3a85de05302a665a97 SHA-1: eb7c720e9e38aaa2dc3c0bf9a94c38eb56069070 SHA-256: 51af680a71a385a9f1d42069c5c8ba6d732db50bb0870a164f94b9cd4afd1a1f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure indicate an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://krisoc.ru/uplcv?utm_term=ms+access+2007+tutorial+in+hindi+pdf PDF link annotation
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609879dc490e0---92484618611.pdfIn PDF document text
    • http://magicdiscoradio.hu/userfiles/file/66822974894.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/serokuvepifefowetisobaro.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/42906793397.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/tigeraduwaronolakilanewaz.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sonoko.pdfIn PDF document text
    • https://purefeeling8.com/data/file/82269619427.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/sojiniwosusunilefoxojeguz.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/95378290847.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/tuteliz.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609052577bbb3---89622424734.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/97638812845.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdd2c27db2b---telamazaretojisazufuza.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/kiwej.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/56718302441.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/33d3ac29fb1d84730abb54b1c3a00cc6/34242043778.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160907940809f5---18544787525.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/ae461e90460e0c1ed8e31188941da64f/89021328613.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/mizuvuxanixugijajoposa.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/55808c65b5da76ee6dda69e3ad5574f0/51675886460.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609859f543e19---dasixulupej.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/7a79f80342eade52f3fcee2638cdedd5/2983689768.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/7d339433ae14fb17d77d6149996f9d11/90013942988.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/72916820616.pdfIn PDF document text
    • 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_off0000d1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA05 11100 bytes
SHA-256: e3f979fa53783ef10c7939e111cc012e3c78c8be03a3bb8c3896fbd04e44fe85
font_02_sfnt_off000103e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E5 17120 bytes
SHA-256: 5d9066ae1e96b629201c80f8ab95b6661e0c721eb3c362d90cf85b6a639159cb

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