Malicious PDF — malware analysis report

Static analysis result for SHA-256 dad23ff20b0b3cfe…

MALICIOUS

PDF

87.2 KB Created: 2021-09-21 21:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 26db7d20c41f6a0c370119918a9dc3ae SHA-1: 4fb3b0f5030161a4297a704b14d3c2b3dfa387ad SHA-256: dad23ff20b0b3cfe553403e9a9b0bf90cdd6605d754691271205b3e8644e4421
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous links to other PDFs hosted on compromised websites. The presence of multiple links to compromised CMS upload storage and disposable hosting suggests a phishing or malware distribution scheme. No scripts were extracted, and the document body was unreadable, but the overall structure and URL analysis indicate a malicious intent to redirect users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161431baa82ca2---87232574119.pdf In PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/zanetumod.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314959c98b6---vujifadi.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/bixakazafu.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/pimenikip.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/tafopupo.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/dudujopazebopegigabiv.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/49967629418.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/doraruburariwukisopefitok.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/64527kfj3vstv2acfvvmpc2evb/28733419783.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/19390194040.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/17467297027.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95384072578.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/c6da28e399c4f55320fa8e5afe5b785a/87862648866.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/af57a0bfd8e7f4ef810688875d134676/xivarukogej.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109191623375306.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/surozesijijab.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/96826205996.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/93f6dfcbe4e0b2a3de4b18dfa9202c14/83455159433.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6ec4278d7---9283784995.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/35408788690.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/5783707225.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/64323242015.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=gunship+helicopter+3d+mod+apkPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/0ec337198363c6f6093f9eace3f03c50/46789737527.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_off0000e6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000feef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEF 11184 bytes
SHA-256: a63ee05bcf161a0c378683eba619b18fbe8465a8c66750bd60ca9fc72fd78966
font_02_sfnt_off000118ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EA 21284 bytes
SHA-256: 46651c99f39f261047b859f32833660c686d1605d07d059f4862c51bd3a8aeec

Open this report in the interactive analyzer, or submit your own file for analysis.