Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c611f54bb4236a7…

MALICIOUS

PDF

74.7 KB Created: 2021-09-27 05:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4f23ec71d621392b815a3482d0c91557 SHA-1: 1318558ccd318ffc766155d0b2871b9b967ce58e SHA-256: 7c611f54bb4236a72cef128e48a06332d7a2cf73b7703ec210c8e821dac4bbb8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external links, many pointing to compromised WordPress sites, suggests it is designed to redirect users to phishing sites or download further malicious payloads. The file's structure as a link farm on disposable hosting further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://crewmak.ru/uplcv?utm_term=lava+lamp+live+wallpaper+apk PDF link annotation
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e39a31d7a8---ralewo.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/woluseruzifeduxiza.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/vupeluwotiwute.pdfIn PDF document text
    • http://aibrpjoaae2.specialty-match.com/upload/files/86442956023.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/k7fnf4mfihl0n8irnp74n95gl1/rewixunejokali.pdfIn PDF document text
    • https://bonaparte.cappencms.com/templates/files/20790919398.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/nemosa.pdfIn PDF document text
    • http://tuzy.pl/Upload/file/luwazewowajopoworam.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363e52df698---57619323518.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/50022594239.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/lafigimoferofevux.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/41255047957.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/iobdeq4qh0le462jmckc92t3v3/podezufodegitamawub.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/xabawa.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/dulezakururatepukosek.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/49430254900.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42997976827.pdfIn PDF document text
    • http://186086.com/upload/files/10944120552.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161374ae54e18e---41136991211.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/97262176741.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/71303611129.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/18857083105.pdfIn PDF document text
    • https://farsiherbal.com/cache/fck_files/file/60263884792.pdfIn PDF document text
    • http://idevoz.rs/files/dogesasufinasisurufe.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/51820785211.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_off0000ba29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA29 10124 bytes
SHA-256: 6b323a59800db5766bb2c5a97f481a46f72e2caa1c14a3a55bc3cb11fa0330f2
font_01_sfnt_off0000d0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BB 19920 bytes
SHA-256: 8e0552f3cf76facdce3d14d09b08d31c1960897e01d36aafcebbe36f468c5e5e
font_02_sfnt_off00010391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10391 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1