Malicious PDF — malware analysis report

Static analysis result for SHA-256 d72bcc0c447a4439…

MALICIOUS

PDF

87.3 KB Created: 2021-09-01 05:05:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3b8deb79b6c03d0b27a8bfd6c4e1dab1 SHA-1: c87826c61814991cf2485aa2048d551ce87365fd SHA-256: d72bcc0c447a4439abea075fc76aab5ed4dcd645d7d788e71ae82c5d4481d54d
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and contains embedded JavaScript, indicating potential for malicious scripting. It also functions as a link farm, directing users to numerous external PDF files hosted on various domains, some of which are flagged as compromised CMS uploads. The embedded JavaScript likely facilitates the redirection or obfuscation of these links, contributing to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4368

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://vishwkarmaenterprises.com/webroot/img/userfiles/files/tenimobe.pdf
    • https://0900107678.com/upload/file/kejaz.pdf
    • http://ks4073.com/file_media/file_image/file/72469380509.pdf
    • https://uleshuzatabc.hu/files/file/xebelamobidevalisim.pdf
    • http://thenext.pk/userfiles/files/33695498847.pdf
    • http://stark-tools.ru/images/uploaded/wofegaxefan.pdf
    • http://chongros.com/userData/board/file/20196509926.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/ombds6ht9n7maqc8746e9cuf27/44466240508.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/69sri9c0qs438m7gsqf21lincs/29422059006.pdf
    • http://ohsongpharm.com/ckfinder/userfiles/files/7816095979.pdf
    • http://amuseonline.com/absite/userfiles/file/jubibebiwenelu.pdf
    • http://naitikfashions.com/ckfinder/userfiles/files/13955965238.pdf
    • http://s-privod.ru/userfiles/file/rogezej.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7ccf3d4b8---jifokireserevedajenoka.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/51b0cb3bb913f9690c37a53fd41ddac9/talofur.pdf
    • https://i-chat.tw/js/ckfinder/userfiles/files/juzawurewugixunowulapujug.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160834a7ee4dba---dogumenekuwegekedawamak.pdf
    • http://gtlitalia.com/userfiles/files/nubininowokuwetewunofagu.pdf
    • http://phantasos.org/userfiles/file/4736069630.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160e5772805b7f---54577031953.pdf
    • http://kaushalacademy.org/ckfinder/userfiles/files/47406810422.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1cacedf1a---nuzarukipolataritafo.pdf
    • https://bititechnika.com/uploads/file/rabobixuvegukenida.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=songs+for+your+children
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010734.bin
2f2f26eaedf7edf08b775ac73304fdce0f97b954db9ec16a06b7bd80258c1728		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10734 18576 bytes
font_01_sfnt_off000137b2.bin
c2cfd57a52a7b8098a4d3d038f1d601074fdbe54423549a693d5c944d560f774		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137B2 10784 bytes

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