Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ae008b186f3d0b0…

MALICIOUS

PDF

81.8 KB Created: 2021-08-24 06:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 632e1bc44a96df212494ca8fe087d700 SHA-1: 76d777b7299d20a04f293be92366045158f1304b SHA-256: 4ae008b186f3d0b0ab0f812f18f4c0fbdbd9c0a47e93467bde02b0539c4a8495
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 hosted on compromised WordPress sites, suggests it functions as a link farm. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://cructi.ru/uplcv?utm_term=reason+for+body+aches PDF link annotation
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b535a69b6f2---nawisope.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/0dc7e26ee4bd958ecd6eca4b626075a6/60495877600.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/ve6ab0ignie58aqjbff4osv6s6/lubokazarivinasirube.pdfIn PDF document text
    • http://nktrading.qa/file/files/80131667667.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/15593266221.pdfIn PDF document text
    • http://hornets88.com/clients/56662/File/81917646812.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/pk8tm53a5m8248eb7iiofggvak/gewesiwe.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/77609509674.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/71615619022.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/bunupifopesuvufutomuninon.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/e502208137d26733b1a87c7a834d3500/wavelezafuruwebojuguni.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71f3aed8b2---40956932479.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/45078590195.pdfIn PDF document text
    • http://esistore.de/userfiles/file/toxosumevi.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210603111354_2007111981.pdfIn PDF document text
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/f6b0e5ab615075f564b6d309f2ce8a8d/67672263268.pdfIn PDF document text
    • https://techlan.pl/files/file/30530499449.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210727_221639.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768ada3d9c5---84215300353.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/getorufevisiz.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/nukegotafel.pdfIn PDF document text
    • http://es-hanasaki.com/yamituki-n/uploads/files/femowilaxunade.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/o91qf5bu11ffjihjk7520niq5b/ropaxuwovedugegokororemu.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/1bdrds6ccjklj5a2p13v5m8kjq/50168612230.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_off0000dde6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE6 10636 bytes
SHA-256: 6129151e1e2b63370c4882f99b5d4ff65ef259937d8d89a0807c464c5254986f
font_01_sfnt_off0000f62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62E 16636 bytes
SHA-256: 66760319d33c5c6f6d442fe1b7be1e09629ad44f50321575fd3f42938f88e1ca
font_02_sfnt_off0001214a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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