Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd93fcebd0415e8d…

MALICIOUS

PDF

79.9 KB Created: 2021-09-03 15:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ebbda76959a94c1fbb629ae00538476e SHA-1: 4f3c97fe84cbcc6c16cfbd810828be9386c3718a SHA-256: cd93fcebd0415e8dcac4b3d274e2b69d803ab5288b9f9e3fcdb58e6c6c846c14
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many of which point to websites that appear to be part of a link farm, with some hosted on compromised CMS uploads. The presence of these links suggests an attempt to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=ibps+rrb+scale+2+previous+paper+pdf PDF link annotation
    • http://speaklifeiamgreatness.com/files/files/jezokodifulezitixukevuzu.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bokixadulakiwoxovedix.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/39499448585.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/23874713091.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/sobodovamikaluju.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/36946354579.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/f363e39vmk5d4isa2p631nnung/12906208660.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/64913809766.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/giwusaxobetu.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202108250100105985.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/xafamipofuxinomedare.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c6965d435---zulunatix.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/gufudepadomufijimiladu.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/a070b6488beb93fa6227ef397b658a46/vaworiligovug.pdfIn PDF document text
    • http://industrialdevices.in/uploads/82375878316.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/59621246138.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086de1781005---gujizuwukiwopukajapofere.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/16603758131.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1b45d2254---62591161424.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/69lj13aiprj3v6c14q2vtsobfg/480433900.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210726_1CC85CC8A3441EE5.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/61886125595.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_off0000cfc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC3 10788 bytes
SHA-256: 5fabcb93889b34960a8d2581e323eb0f8c949323771937480fa42ad64963b3e9
font_01_sfnt_off0000e88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88E 19100 bytes
SHA-256: 675dad5a1445834cd831b48aa05f1b4ebb7b98c4f9243413e562a40aeefed46e
font_02_sfnt_off00011a6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1