Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe7bc6dc2d86a4b0…

MALICIOUS

PDF

87.0 KB Created: 2021-09-23 02:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 68330cdc0bd94256a8f774d7c38bb731 SHA-1: 88ca4799d33ca8e11bd96705af18908e0050fd8b SHA-256: fe7bc6dc2d86a4b0f880d66d7912f64479cd185269931656f9c277592c3ac9a9
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple URLs, some of which are hosted on compromised WordPress sites, suggesting an attempt to lure users to malicious content. The document body was unreadable, but the heuristics indicate a malicious link structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161371d87dbc66---lavakaji.pdf In PDF document text
    • https://cafemocion.com/userfiles/file/niropimajamoxe.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/vugoponadisoruzofa.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/gusaduwodisunuvalovubot.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/fb9866db4e82e6a3e2a77e1bdb1dea2e/16647728743.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/85209443405.pdfIn PDF document text
    • http://www.pvvc.cz/files/37841116063.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/92972365674.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/sizotazumanajal.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/13838533822.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/vufakumulajexupugilorev.pdfIn PDF document text
    • https://reclamesticker.nl/images/uploads/file/In PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/fatus.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161352e66319c0---65799350705.pdfIn PDF document text
    • http://webbuilders.com/files/file/voviwogufokifij.pdfIn PDF document text
    • http://koutingchina.com/upload/files/41962959302.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/lekudulekiv.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/fugitovo.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gusugivuvamivura.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613915c03ad58---febajunop.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/36163922427.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/midipojoduzotamukakugi.pdfIn PDF document text
    • http://waypl.pl/upload/File/sufodadutarakavixesigu.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/92581848286.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/27861257459.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210917111239.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/1e3f297052962ffc431d8e2ea9f774c0/24999163201.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=gay+android+games+apkPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC20 18200 bytes
SHA-256: 26edd9c5427e4022bf39e92305844a94a60f7e9f2c7d15eb14d43684788242e5
font_01_sfnt_off00011c00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C00 10836 bytes
SHA-256: 229906b05c64311d2585454d2992de03268545b764c8a9b71cab76194a867306
font_02_sfnt_off000134d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1