Malicious PDF — malware analysis report

Static analysis result for SHA-256 730ab1101255983c…

MALICIOUS

PDF

79.0 KB Created: 2021-10-06 16:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3e095830e11f1c5f2a1cd82b91fb2a60 SHA-1: af3ed58dcff5c41f058b37fc095511eb8a38d0e0 SHA-256: 730ab1101255983c56da12fa60239041248e4e061babb1297f9c4afbd4429e4b
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or are part of a link farm hosted on disposable domains. The primary attack pattern involves directing users to potentially malicious external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5399

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://smidgel.ru/uplcv?utm_term=how+to+validate+digital+signature+in+pdf+in+mobile PDF link annotation
    • http://eros-arena-reutlingen.de/eros/userfiles/file/7517624063.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613452b05ceb9---sosaxuf.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/nejazinogoni.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/48851793681.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/fevedizatoxafa.pdfIn PDF document text
    • http://xn--5dbfbdrd7azav1bcx.com/sites/default/files/file/kisexukebosirifo.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/womobanijojejojaguzof.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/72f777f41808f2886ae7edab8d0de4e9/64971597713.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/vuboteso.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/rajomoxibogo.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/xopajitonora.pdfIn PDF document text
    • https://forssh.com/userfiles/file/lunufiwigurorevoxete.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/47729544490.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/mitixigawudubel.pdfIn PDF document text
    • https://transdeliveris.lt/userfiles/file/68164732406.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/13879042231.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/99863328176.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/sixazob.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/24802563680.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/70147038585.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/4212794531.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/bijudebibazarigepidevoz.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155b9c29dbde---66578813753.pdfIn PDF document text
    • https://villadelauca.com/userfiles/file/vatifinetowudemusu.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/mebuxo.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/kozirazijaleker.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A9 20016 bytes
SHA-256: a54eebc4a6aaa1198aba6904bab14af00257434a5897ad65ed3514c8cd01b0f7

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