Malicious PDF — malware analysis report

Static analysis result for SHA-256 05895e380f638229…

MALICIOUS

PDF

80.7 KB Created: 2021-09-16 06:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9ee532dfb9c58f2031fa631eea46e221 SHA-1: 62821875dad995953031a1bf8aa79a2b37cf4481 SHA-256: 05895e380f63822957a8be4ba836659aca7e144a7f7217176789244b3423b45c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised websites, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the use of link farms on disposable or compromised hosting to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://crysiq.ru/uplcv?utm_term=division+of+nervous+system+and+its+function PDF link annotation
    • http://fiumaradelsossio.it/userfiles/files/kidod.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c8be3dc6a---36921745332.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/36934318457.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614203a3f1b16---puxedizitisezi.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/1855676940613c3781eb56e.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/gamomudobaxadelefafimovux.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/22434271323.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/73836929598.pdfIn PDF document text
    • https://penal-garazh.ru/files/getuponefoxozexi.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/fuzodatepi.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/97132586561.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/77279001205.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/dofuze.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161371ecfb37c0---73128417963.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/40353522041.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/misurevamunaganadu.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/30816103045.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/52162991256.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/mogonobu.pdfIn PDF document text
    • http://boldogelet.hu/media/90799096814.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/kifalukazegotad.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613615f0636f4---21777162970.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/26561993764.pdfIn PDF document text
    • http://www.pvvc.cz/files/jemigag.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/14f559347fa5c4b106133adb3258dfaf/fifisarosodabebiwibefofu.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_off0000d858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD858 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06A 16808 bytes
SHA-256: e8c137798fc414a5bc7730a65569a7b21fa6c9ef41943362c661eb97ec3e1690
font_02_sfnt_off00011bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC8 10872 bytes
SHA-256: 71f69bf73bad35f1af99de1ebdd1ce9c5452c3986281cbca4a96fa2fd035ce42

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