Malicious PDF — malware analysis report

Static analysis result for SHA-256 7671f2faabfabfea…

MALICIOUS

PDF

83.1 KB Created: 2021-09-11 20:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 967b39b7f4f266aa48f9cfbd84dcedb2 SHA-1: d92f9e64a5ebdff858b4670087e5f32305f62ee4 SHA-256: 7671f2faabfabfea8a4ac8a886ebc507924f1a41cf8c0a20928cc37278b34d8f
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ClamAV detection and the nature of the URLs suggest a phishing or malware distribution campaign. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3778

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://crysiq.ru/uplcv?utm_term=dota+2+creep+aggro PDF link annotation
    • http://yavuzselimvakfi.org/resimler/site/files/bigegux.pdfIn PDF document text
    • http://sibstroiexp.ru/userfiles/file/94899898361.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/bekenumatojawadigevowebew.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/36769982698.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fae45aae4---wuvuwusurilasari.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/xadavet.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/jeminakexamijatemafopubu.pdfIn PDF document text
    • http://www.tecnologycenter.com/admin/uploaded/fck/file/23486443882.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/penubitosovuxewafexumo.pdfIn PDF document text
    • http://komodovo.ru/upload_picture/fogugomepod.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/86140456573.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/zadebof.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0976ae6ab---xidekepujofafofuzozima.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/mudulojezuwej.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109090527039979.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/jipupixoxex.pdfIn PDF document text
    • http://vititanon.com/user_img/files/96052991373.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/51841517298.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/97488959746.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210904_031048.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/93693548385.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136c75e5899d---43542468720.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/77571459797.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/94525839878.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_off00010014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10014 18608 bytes
SHA-256: 38fa1eb1bd91425bae9585ff0678941e091107f8e2ec8c3705930cffc3901365
font_01_sfnt_off00012ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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