Malicious PDF — malware analysis report

Static analysis result for SHA-256 62e55a6973ee85c8…

MALICIOUS

PDF

55.7 KB Created: 2021-09-07 09:13:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 14b2accb184d657de1ea35661ff011a8 SHA-1: 2de943854551caff569137d9fedd25420fb346aa SHA-256: 62e55a6973ee85c8f88ed3a63e35db0b1e42db92a6e8c88132e0095d15142c1a
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high number of external links pointing to various compromised websites, indicating a link farm designed to distribute malicious content or facilitate phishing. The presence of embedded JavaScript further suggests potential for malicious activity, such as exploiting vulnerabilities or redirecting users. The ClamAV detection and ML classifier strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7984

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://sakuragiramenandsushi.com/uploads/files/sigujoputilo.pdf In PDF document text
    • https://kaisar168.com/contents/files/bosewimowuriv.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/1017b484a49024f61de47489ea66994a/5048295857.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/fijizotiroviwibuzej.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133daf8b114e---82595764119.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/43807086077.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/78594439737.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/20185199224.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/62525499794.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/8c34772ef85d656b82bbd7cc8fa6125a/wumapugegupewutapekaveku.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/dedupubejozatogesomiga.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a49c98a07c1---52020880342.pdfIn PDF document text
    • http://gdfsztal.com//uploadfile/files/73785604574.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/gh9ujp57lo5mntrc6k1374iisk/45941207618.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/domadezofivigu.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/ff517adbe3b4ba47e411d290f72ff492/32210389171.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/44067f38ffab99df64a733adb0b0f73a/2338662105.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/luwasajizodakitonisobewuk.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/88524662514.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/f758ce9302153c0779855a0682200e98/pezovusosixifet.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c1df41ce3---buwovuso.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739a6c52c88---zuredaj.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7phkpjdfm608ah6so9nmruq6g1/kifigukixekosaf.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/89644802143.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b277dba17e0---28657160706.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=sql+server+interview+questions+for+manual+testersPDF 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_off0000c325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC325 10848 bytes
SHA-256: a12a0e5c84ad08d2391e4cdbaba03de0ca0ab3d9baf7e58a90f77abc8c3a7b11