Malicious PDF — malware analysis report

Static analysis result for SHA-256 59d5e28143992671…

MALICIOUS

PDF

84.8 KB Created: 2021-09-17 09:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 06d6557e02dfba1c5534a010e64979ba SHA-1: c72da00bc8fce3e79bc2a6d190512b8e895dd999 SHA-256: 59d5e281439926716a41bb274713bb9eb2ddef66356073d5cff7e14cd053e124
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious actions within PDFs. The PDF also features a link farm pointing to various external PDF files hosted on potentially compromised or disposable domains, suggesting an attempt to obscure the final malicious destination or distribute payloads. The presence of embedded JavaScript strongly indicates an intent to download and execute further stages or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9762

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://gabortech.com/admin/file/89581654242.pdf
    • http://www.pvvc.cz/files/jogex.pdf
    • http://bensonlandscape.com/editorData/file/zewifibasurasejomawisi.pdf
    • http://balie.overeembv-profielen.nl/upload/files/dafitarobakitado.pdf
    • http://cz-synergy.cz/data/file/tajerozegezotusazenad.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/14530c35f028ae83c6fef91dcf64b5ac/55866967541.pdf
    • http://terezmisszio.eu/files/file/soturovoz.pdf
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/nunamep.pdf
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/lorijowupazazedudanal.pdf
    • http://panel2conso.com/userfiles/file/xunigipebofixas.pdf
    • http://sterenstein.ru/userfiles/file/89042121095.pdf
    • https://music-group-store.com/upload/files/99455761090.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dad511c8d7---lisorekanojevadabuzilanat.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16141620ed9edd---puvoxixawo.pdf
    • https://igescanada.com/ckfinder/userfiles/files/68823905839.pdf
    • https://malinaionescu.ro/userfiles/file/8075405936.pdf
    • https://metnar.pl/web/uploads/files/19650201909.pdf
    • http://indyskischool.com/ckfinder/userfiles/files/malogoj.pdf
    • http://datong-travel.tw/upload/ckeditor/files/20210903143600.pdf
    • http://oppedisanorobertosrl.com/userfiles/files/44364109176.pdf
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24455824988.pdf
    • https://nsaimmigration.com/userfiles/file/zudotomurufibojor.pdf
    • https://keluargamimpi.com/contents/files/22839705162.pdf
    • https://grupo-kayros.com/userfiles/file/90194490743.pdf
    • https://autoskola-scp.com/files/48052668597.pdf
    • https://noble-program.site/js/ckfinder/userfiles/files/41141815611.pdf
    • http://sh-songshi.com/admin/upimg/file///18586264438.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=bad+piggies+hd+for+pc
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca97.bin
67861026c806c3ddf9687674bea6b53b350a96f6d160a24f4a0a25a27de143bb
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA97 10704 bytes
font_01_sfnt_off0000e317.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE317 16792 bytes
font_02_sfnt_off0000fb29.bin
c42ab00d63b97452e4957b0421d2092c1e6a113be9a7f696426cbf0a3591a3b7
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB29 21172 bytes
font_03_sfnt_off00012ff2.bin
64af0185a2beffa7382febdf957b2ddd2015d3985e5bc97cf8ad64f3c2914973
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF2 16060 bytes