Malicious PDF — malware analysis report

Static analysis result for SHA-256 c45b75427cfe519b…

MALICIOUS

PDF

77.7 KB Created: 2021-08-11 21:35:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1020e60ca8a29bc941c9bbb474dbe117 SHA-1: cdfdc7a0e48c6657347d6e1c88ffcc4acf9c1c69 SHA-256: c45b75427cfe519b0235570038311affa07678d00f47c90a23734ed0d46f92cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and other disposable hosting sites. These links are likely used to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://coretry.ru/uplcv?utm_term=bahubali+1+malayalam+songs+download+kuttyweb
    • http://klubbelgickychobrov.sk/editor_uploads/files/zemowetumabugiwolo.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608668e7c63ef---gonevufub.pdf
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33710522227.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/87eebd176d8516978cdedf6109ef5e16/podesuja.pdf
    • http://altelaw.com/uploads/image/file/refozamelezinorufokiz.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/8236ce3ebeea84d8313f85051d45695f/24988355541.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/149de9312e2d422e4af1b1b95b6316b8/xelokaforitorivuregat.pdf
    • http://morpheus-architects.com/file_media/file_image/file/923509506.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/f244a347a48ea74c0d721ea577a769c9/fobezazubi.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbba60ca41---xaxinenuzezezugi.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/4bb72040cec952934f2ad2d05adeaa97/wopenalox.pdf
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sevokapafinakogixilevut.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160746ab178601---14000734918.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b009f2b3e8---jibibaworof.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113f1256b32b---73540860365.pdf
    • https://kfmaccounting.com/webroot/img/content/files/48888760667.pdf
    • https://pinkrali.com/calisma2/files/uploads/88140454162.pdf
    • http://xlsferrosilicon.com/d/files/82865950890.pdf
    • http://iccj.jp/images/uploads/fckeditor/file/fupozozuw.pdf
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/bb9dbcb91ab53af5a712f7126c44edad/sosek.pdf
    • https://cissud.com/uploads/ck_editor/files/xupigoxer.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/26a71b7c91f4d823404b2ea6556f2a1c/ketovo.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a021c46b00d---68332094857.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/95b47edac9ba261e9de08d1c240e3d50/84447801006.pdf
    • http://anhuizpyy.com/upload_fck/file/2021-5-9/20210509122626570742.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c924.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC924 16792 bytes
font_01_sfnt_off0000e136.bin
0fc35902e8025d0e5c0a16961c02a82007bc3121141bfe88f8124ef237733c26
pdf-font-stream PDF embedded font (sfnt) at offset 0xE136 16952 bytes
font_02_sfnt_off00010d1f.bin
1e9013ba43635825f75fb6f34d45d4d8fedc09da1b585d62e9c1529e65fd6afa
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1F 11232 bytes