Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2430e46d87fdcc8…

MALICIOUS

PDF

81.4 KB Created: 2021-09-04 21:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2e747be83320c2760808b75e6911d43f SHA-1: 562316325a2be0917103d5801221041e020b7b22 SHA-256: e2430e46d87fdcc89484f4d2cb35e8db07438e4967ac037def3891ee8cbc8caa
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. It contains numerous links pointing to compromised websites, many of which are hosted on disposable domains or utilize WordPress upload vulnerabilities. The file's structure suggests it functions as a link farm, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=chicago+manual+of+style+bulleted+lists+punctuation PDF link annotation
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160958fde03d04---68883666250.pdfIn PDF document text
    • http://goreskyreunion.com/clients/b/ba/ba087d28c24afe6c5bc45fa062332e47/File/37541581032.pdfIn PDF document text
    • http://stl-hk.net/userfiles/modimuda.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612603b7b796b---foniwun.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/mubuvexolunixisaduki.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/t8k8v86vs2epb8p3fmecbmriv5/36673086042.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086f37fd1b2b---95070333432.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4d462ce1d---bofemofuxezobukilogebijav.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/faropa.pdfIn PDF document text
    • http://oodow.cn/upload/file/2107300522153981291ica2jvxmlew.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/gakodinoxi.pdfIn PDF document text
    • https://rovetco.com/userfiles/file/49771038553.pdfIn PDF document text
    • https://defi128.com/userfiles/files/gegag.pdfIn PDF document text
    • http://afro-safari.com/upload/files/12840062615.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/sewaleturuwipo.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202108202212268278.pdfIn PDF document text
    • http://all4pets.cz/ckfinder/userfiles/files/tutowideguredezojupatari.pdfIn PDF document text
    • http://dejede.com/userfiles/file/35816235148.pdfIn PDF document text
    • http://sapaethnic.com/webroot/img/files/vozuw.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160cb85eb70bef---xowefonekab.pdfIn PDF document text
    • http://china-miyaco.com/img/file/20215278340.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/99dac630b89d8d37244d666bf0ea1c92/27511298743.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/bowenedi.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/59835085431.pdfIn PDF document text
    • http://minipit.com/data/files/74162051070.pdfIn PDF document text
    • 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_off0000d494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD494 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAB 11352 bytes
SHA-256: 8026c002a37242dd8d90db63346590418377404c534110d8bc698264ac8ea2ef
font_02_sfnt_off000106dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DC 18720 bytes
SHA-256: b786b477b5de5fd0b1f1f346a67f9c20e76200ce9e27bef1f8847ce876897eb2

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