Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5c325e44c56c4bc…

MALICIOUS

PDF

70.3 KB Created: 2021-09-11 23:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a82bec250e21f91c11ae876e9679d186 SHA-1: 2e472345c6ed4c0f26269e57662eeef24842ddab SHA-256: a5c325e44c56c4bc2bb286fb14069a22235e216b075df1eda9386d52eed1770e
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8398

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://sapporopools.com/contents/files/54196748143.pdf In PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/387cabe77ce6be35db110ac52e24cfb7/2510019584.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/51728322692.pdfIn PDF document text
    • https://quangtriasianwindow.com/uploads/image/files/gekoxomewolijuzalekotori.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/beredelirivumifanusevi.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/mowidugajovederevot.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130ea1cd0faa---napejo.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/jugamelekisinagej.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/kapis.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/25102024800.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f514bd95bb---funawikiretumudimatep.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20066766532.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/62a23b5df81e4c7a0bc8d4e726583251/20559121028.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/55220089411.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/90274491454.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/3975052215.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/44361249935.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/vedidizurowatedogesid.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/65404339682.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/piwag.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/69319395364.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/pexofupivejanolat.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/gq7s0f0o5mbpqo211f3imfp6ct/80635429195.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/71377062687.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/71769744564.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134271369004---mokobowaletiramizutepa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=rick+and+morty+season+5+episode+2+watch+freePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88C 17624 bytes
SHA-256: 03ac0941d3840cb52cd4b6cc04d2b50be22cf2b82983f9701d515f2e564230ff

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