Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7db637e2b15e75c…

MALICIOUS

PDF

85.6 KB Created: 2021-09-02 13:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: e132c21eff3ab8fc84fe489646de7b80 SHA-1: 2405a7fe3a0af0efcb8ea9613ca7cd96869eeb8d SHA-256: d7db637e2b15e75cc4b650c42824101446d5d747a109c6c8b7d8e68fcb9c609f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca59fe10da---70101585737.pdf In PDF document text
    • http://elma1.ru/!upload/files/91882139384.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099073eeb798---92125779541.pdfIn PDF document text
    • http://childhood-matters.com/clients/49507/File/18523523234.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/webowali.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/cmcetv7mq709fjr8t3p14gm75a/92162332183.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/38271695542.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/56490239359.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073aac8ed5d3---nezuxudubetuv.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/87134290476.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110cb9932a34---faxuvaxiremuvapimapozaw.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/08e37e6cc9b8df1ff8d1c377c5b620a6/36055671705.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/xekatafanat.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/73b79f603e0eff5e9e2a321648a3fa45/6228073554.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/a81a5f9a7ea791249c9e82260d9f6aaa/fugivixipupavuluxewefa.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160db18c58cb59---kuzevusetugapiwadidodoxa.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/lufomijemozag.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/161060775ba7a9---21722956336.pdfIn PDF document text
    • http://metall-press.ru/files/giwuviwigudetadalux.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948d341a94c---gikaguriwanejopagagubases.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/7f0297c582d9c249af83a06910de3414/jojegosejomijodazuvesen.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/judozokefapoz.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/e4tiu2v8m26980dj6iitf4itf1/bizunirosaper.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/bifirotod.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/5d22f480629d5f36cef610ab3b4544a4/kixofipip.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/27264436800.pdfIn PDF document text
    • http://richfieldhighschool1969.com/clients/868116/File/tajimapixobanubepeni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=simplification+and+approximation+questions+for+bank+po+pdf+downloadPDF 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_off0000e31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB30 18884 bytes
SHA-256: 3515cbc9c7841e51cb3a06013b3a0f0d3986487f2ea97af8faabe0b73d3fb213
font_02_sfnt_off00012cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CEF 11520 bytes
SHA-256: 17397b11323a8fa81168637cefac65a8f043596cb6d16a2a57f96d9bece315be

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