Malicious PDF — malware analysis report

Static analysis result for SHA-256 caf8bfd26ec828a3…

MALICIOUS

PDF

109.3 KB Created: 2021-09-01 00:28:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 25621b08b50cedd07577dd4a42cbd9f2 SHA-1: 8482afdcc3f3d62ff463b5b3e6c5cad74866cf59 SHA-256: caf8bfd26ec828a3519a6312cdb01ac56295c1b965685b22d60b04fa53369e00
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many hosted on disposable or compromised domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9190

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 http://membranekeyboard.pl/_data/file/dewatusokizunuru.pdf
    • https://cleaner.pl/userfiles/file/girapuxasimirofe.pdf
    • http://evola.it/userfiles/files/wotugodimobupasuvijat.pdf
    • https://clearpatth.com/userfiles/file/movopenefewaxitefijatapij.pdf
    • http://pressvaluation.net/userfiles/file/subopakitewerosuri.pdf
    • http://aj-logistics.com/stock/userfiles/file/molagoxanasudujamimulal.pdf
    • http://baove247.org/upload/files/47201225196.pdf
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210625180831.pdf
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/72151483385.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c34ace0f8c1---lotufipelopugu.pdf
    • http://bezpiecznamlodosc.org/files/file/buzeroxaxijufowal.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/0l0p86uff42jlf7soj90mue6b8/lomebulojotaromofidexi.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c144d6082---wusonofu.pdf
    • http://cngwalk.com/fckeditor/userfiles/image/wafomawonanapegogezekos.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b81a65dbbc3---jatototowimupena.pdf
    • http://winkeleninzundert.nl/uploadimages/files/14879695716.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16129972991cb2---dajewikagul.pdf
    • https://thietbidienmanhcuong.com/upload/files/mipopuxeputavitipomom.pdf
    • http://nomaquito-travel.com/editor-images/kupani.pdf
    • http://sdes.in/uploads/69740960895.pdf
    • http://adria-ex.com/images/blog/file/bodoxezuf.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/8hjtiekin70341aida0jfhred0/16516175829.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/s8nsmu6q71c6nk9chvs60divbn/mekasavud.pdf
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/zidedebimelirikunamexul.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=outlook+room+calendar+permissions
    • 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_off00019e32.bin
6e78e710740bdeccd485de27df9a025ec53517bf7dfc76290b31970f6143c60c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19E32 10892 bytes

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