Malicious PDF — malware analysis report

Static analysis result for SHA-256 233272ed442be401…

MALICIOUS

PDF

65.1 KB Created: 2021-08-29 01:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9ba649cef6ed5f252126c6c344928896 SHA-1: d3ed6aae515ec4497bbabb9f6e04af1bfd9e969d SHA-256: 233272ed442be40130be8b9bbad70caa55216b4a99668778746ce0eee0df1fcd
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution by redirecting users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9524

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 http://cesmclassof68cheyennewy.com/clients/82478/File/86488047266.pdf
    • https://vv-alc.nl/uploads/files/gejixoriwitesotef.pdf
    • https://almuhja.net/ckfinder/userfiles/files/bikogibowetizazoja.pdf
    • http://net-marketing.hu/images/files/45715667396.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a3eedda3a5d---zomuvedabijuwilixo.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fe797def9---kiritadokim.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-5-28/20210528152528651353.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3d3d7770c---kumalasobumudebipi.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1609bbfd4895ae---duruniwikedopamezeju.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988e2c2a170---nebiwo.pdf
    • http://keyflounge.nl/userfiles/file/30355590131.pdf
    • http://kukubara.com/zdjecia/file/72698080927.pdf
    • http://thompsonhigh1980.com/clients/4/48/48b9e10b24f1ac3c627dfd5bb8c45987/File/mulepawef.pdf
    • http://dgxzz.com/uploadfile/file/wadinid.pdf
    • http://genbreedpublisher.com/files/upfiles/file/jivuvovuwanum.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/udd8d3b5s30fkp855rv71b7isg/bazoxigafakigun.pdf
    • http://giftboxvietthuy.com/upload/ck/files/jazeredapubitu.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc42910b96---7309573304.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd63b76bf3d---26156385076.pdf
    • https://konferencii.ru/js/ckfinder/userfiles/files/sogatewus.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160805d26d8ab2---xawiguvexuxojezokuren.pdf
    • http://bpabv.nl/uploadfiles/file/relolivunujejazivetumez.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=garlic+roasted+brussel+sprouts
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ced7.bin
6fa0e5eb5300c17977907b4ae6b6f5c976de1e317debff4d1eda6652783f7ad0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCED7 10684 bytes

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