Malicious PDF — malware analysis report

Static analysis result for SHA-256 9036eb16b85bc0c1…

MALICIOUS

PDF

92.1 KB Created: 2021-08-08 21:03:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ce29373bdfcf9db44dc618d5f83ab7a6 SHA-1: 24ee61b6c589fb9bbc0bec0414fe1072f6730850 SHA-256: 9036eb16b85bc0c1293df26f92f4f7862d65a43791cd568b0337752c04b60df5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high confidence score further support a malicious intent. While no scripts were directly extracted, the structure suggests it's a lure to download further stages or lead to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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=ncis+new+orleans+theme+song+tab PDF link annotation
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160fc8d7140ccb---pevuvoto.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/pazosufogakawepusejev.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/3furgif701ma8kq48je8nmsbj4/vejimesopotozoruwupa.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/49398334377.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d08f15afaba---kapolalovave.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/kewel.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/69098320662.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16086b152438c6---mofewakukixo.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/r9cvgsptk2e56hat6leb0q4lvj/rizedabeveligelerobizilol.pdfIn PDF document text
    • http://leton.pl/userfiles/file/kuzirijoral.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/wumowilixeromusuwizef.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/83001967123.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16077a3f4f1462---21721989061.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/2a1989199aef2ec74ca46c6d41cc0d86/mekisokaliladumotedok.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/a2c74jq57bjlan2e1u25dbmo30/64985009942.pdfIn PDF document text
    • http://fhs76reunion.com/clients/0/00/009202203981f132fd14d012a57c0fe5/File/kupewujolubep.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/ragew.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/1270174191.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/7givvme3aa8nr747v4gfs8nvc6/85212276573.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/xamagowudozowobijera.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608180c26363d---saronazazewipapotoja.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/pizigedeveguket.pdfIn PDF document text
    • http://natproperty.com/userfiles/files/gifapugepujidewoxat.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210726_E997B071D0494E2C.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a73161416bb---95632538094.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b1fd82ae4ee---wanomujebowod.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021080605063038700.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/75098054363.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_off00010278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10278 17900 bytes
SHA-256: 0d9285f2d0968627014fccbb406512c37262b9ab60a85de004a41ece0a8d1fab
font_01_sfnt_off00013122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13122 10880 bytes
SHA-256: 03f42ae892f4bc6112d4c56c932aefdf8cce235acc75367ef5cf8b4e790f0202
font_02_sfnt_off00014a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1