Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbb9a29540ef64b3…

MALICIOUS

PDF

86.4 KB Created: 2021-09-23 12:22:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c5ff34a4e6b42881842e7ea27d18616c SHA-1: 83be4b3b8be1fe35b36457072fd2abee5e0ec520 SHA-256: dbb9a29540ef64b3bf054fc425ba88a755eb3666bf6201ca57cf5cd09c7f74ce
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, and the document body was unreadable, but the URL patterns are sufficient to infer a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://saleskerala.com/ckfinder/userfiles/files/80714294356.pdf In PDF document text
    • https://viboot.com/ckfinder/userfiles/files/95552044041.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/1ada0c843ac8ee89b0b2f5a7cf1d3bdf/kilimewanetodid.pdfIn PDF document text
    • http://tagsu.com/attachments/fckattachments/file/82883255113.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/050236213973.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/zisuriwedazobud.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/32527574802.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/8d50ee4e5ae5743056b5ef47ff6b8ece/vokokaxegera.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/mujobezavejevogalu.pdfIn PDF document text
    • http://www.jasolasia.com/image/upload/File/73400750690.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/desifixodakutoj.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130067fe73e3---14448884.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/girasapimewufop.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/jirodobaturigidafilimar.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148ea7531082---xunikufuwovajazodikawon.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/51924601171.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/5eef15701b3301bb6c5546e7c43079ac/wamanidozusofuj.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/bipakowimuwefikofob.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/bonapipoxametutewalev.pdfIn PDF document text
    • http://vietcem.vn/public/default/ckeditor/files/zisepejajilu.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad810d3811---finekojira.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/gagumedojovemonod.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/mefasob.pdfIn PDF document text
    • http://ed-union05.ru/files/file/32837510495.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=babumoshai+bandookbaaz+full+movie+hdPDF 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_off0000ea3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001024f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024F 18464 bytes
SHA-256: 7ad60755b7ee498ea434011767e78cbe17adbe1fcd6fccf5822971db3e51c7e4
font_02_sfnt_off0001328f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1328F 10932 bytes
SHA-256: fc795139d2a0ceaad3f7ba253e0c48a30edb397e196b1338fea53f39e55c4786