Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ca8be79999dffd8…

MALICIOUS

PDF

91.2 KB Created: 2021-06-28 12:25:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6e9313dff85a4743d16c1f20cfb639af SHA-1: b16d2796ec3b5220e60eb0f2c53d001be534a9f5 SHA-256: 6ca8be79999dffd82d3f68409c3d64645366a5a01155618261e4ee47893fae54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous compromised websites, many of which are hosted on WordPress installations using the FormCraft plugin. The presence of multiple links to potentially compromised CMS upload directories suggests an attempt to lure users to malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b18eb58d18---30579737737.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6378b9ea91---16003411404.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/3sv1cc6869oh2dbn5ov3k626fg/50087257394.pdf
    • http://graphicyazd.com/ckfinder/userfiles/files/27742807096.pdf
    • https://latework.cz/soubory/32755061426.pdf
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/q1b9bir3q8lue2tbaikihv7fet/89324009791.pdf
    • http://fitnessklub-impuls.pl/uploads/assets/file/42398214925.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa43ebba7c---jixufitesir.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b127a59620---xagoruforadimote.pdf
    • http://aggengr.com/uploads/CMS/file/gibofanuru.pdf
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/7ce13dc0ce0e4d14861702e105b6376a/sexigibafis.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079375ddc8c1---bisosove.pdf
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/4f7601458b984ceebe72dac3cc65bbd0/jidopiruzadipemobutube.pdf
    • http://ozdoby-betonowe21.pl/Upload/file/jagizikeb.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/7caf69c8789cef37b5574f561e378d67/xapanovoditusapivomol.pdf
    • http://ricarda-allegra.de/userfiles/file/1518484389.pdf
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/47d58b61a475446dbff46be00cf3d1a8/13743327726.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160731ea29f1b8---87719717832.pdf
    • https://patoman.ro/ckfinder/userfiles/files/suzaxibusagufimifenuki.pdf
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/12267765915.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/43fe583f07e21203958543b19d378f9d/zasanefalole.pdf
    • https://airshow-bg.com/file/xelosujoxakegavabuw.pdf
    • https://najlepsze-w-polsce.pl/uploads/39795831881.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=difference+between+formal+and+informal+education+in+tabular+form
    • 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_off0000ffe4.bin
e230ce704c4049b8b92f5e395914c4f3c0c670a835216fe46422adebb379b9fa
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE4 17060 bytes
font_01_sfnt_off00012c3a.bin
f5ba2e55f41788ffc971ea80f2237898defeec60e0647e5ca81b0096cc6658f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3A 10796 bytes
font_02_sfnt_off0001452a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1452A 16792 bytes