Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f638b3eb8614bf0…

MALICIOUS

PDF

63.1 KB Created: 2021-09-13 16:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cfc0610fba02f1de9eb9159da20c9d8a SHA-1: ef88c715ce870882480ba28710c9bbbd823ac97c SHA-256: 2f638b3eb8614bf0a866de2196ddc65ecb985a5cbe33fe16241904fce5ccaddf
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of URLs, many of which point to compromised websites. These URLs are likely used to host malicious payloads or redirect users to phishing sites. The ClamAV detection and ML classifier further indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6468

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://htcpost.vn/vietpost.vn/img_content/file/gikuzowomenixuwagixuvax.pdf
    • http://rspon.pl/images/wyswig_images/file/sasijapadakoxu.pdf
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/nofojut.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdb256561e---84376508578.pdf
    • https://faresaldabbous.com/uploads/files/sutojiz.pdf
    • http://cserepakcio.hu/xdata/file/datejanidir.pdf
    • http://zhongguohuachun.com/d/files/93962901602.pdf
    • http://rotarybrescello.it/userfiles/files/65140515964.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356631219be---18771941211.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613576b9d62a4---vokuxezalezalixidet.pdf
    • http://classiccar-jp.com/js/upload/files/23887721939.pdf
    • http://puginternational.com/ckfinder/userfiles/files/tabilasakon.pdf
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/simozilakipopikideg.pdf
    • http://space-edge.com/upload/files/46686758068.pdf
    • http://www.petersonassoc.com/emailimages/file/kuvapuga.pdf
    • http://omgmediatank.com/userfiles/files/xufogebug.pdf
    • http://erainbowrealty.com/userfiles/file/jupigupobi.pdf
    • https://eltonltd.ru/sites/default/files/uploads/javidixurenamivopizabom.pdf
    • http://montex.pro/uploads/userfiles/file/42406269394.pdf
    • https://lyubomiradineva.com/files/file/zifosisowowanowi.pdf
    • http://jjkxmy.com/upload/files/202109062154019766.pdf
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/94194764424.pdf
    • http://chafewyuok.handysociality.com/upload/files/rutiximobu.pdf
    • http://cozycornerexpress.com/uploads/files/vorufewotom.pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/pipiwus.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c777e20c2---98433038963.pdf
    • http://epmachine.ru/d/files/55358533015.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=mp4+converter+to+mp3+apk
    • 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_off0000ca15.bin
1c718a5662a6bc4b056f4db37679474039e91a46aba7aa009d56dcd9ffafe71b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA15 18264 bytes

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