Malicious PDF — malware analysis report

Static analysis result for SHA-256 8517bc68b3f37eb7…

MALICIOUS

PDF

81.2 KB Created: 2021-09-08 17:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 706562dc36939542b0e4e875c0941221 SHA-1: 9ccfc1b04b644e2dd526b4707334f1ebf389d56f SHA-256: 8517bc68b3f37eb7b66d59097f60e1c9037f6aee3a5ecd8ba0fb266ff2776091
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of numerous external URIs, many pointing to disposable hosting or compromised CMS uploads, strongly suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm its malicious nature, likely as a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://maintogelonline2.bet/contents/files/78518152047.pdf In PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/88639284252.pdfIn PDF document text
    • http://oris-am.com/editor_up/kuvolunoxulaluzinewori.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161312a0b95fe5---zujavajixutufumekewe.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/20062751132.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/babibitafaf.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/vepemara.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/magizidox.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/pozoxazekonaraguku.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b3c32bbd8---58527387613.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-8/20210908092129123697.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/pamawedagunet.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/18189488921.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/gisitoj.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354c44c0dd9---juwipuputotujapeduru.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/vajofasokiketupemaja.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/mirazomedeguzan.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/49722043685.pdfIn PDF document text
    • http://timebymtm.com/upload/files/zovowudakimaweki.pdfIn PDF document text
    • http://xn--9n2bn9mz3aba29g44r4o0a.kr/fckeditor/userfiles/image/32448683303.pdfIn PDF document text
    • http://e-district.org/userfiles/file/vuside.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68855116085.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/58866285303.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/29514823773.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/69575861306.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=appium+tutorial+pdfPDF link annotation
    • 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_off0000db34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB34 17288 bytes
SHA-256: c838a8464af2a12fe9e46c4af52784134dba1a226dbb06e37219c473ed808ba8
font_01_sfnt_off00010854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10854 10336 bytes
SHA-256: 9c6a8d43ec5fa485d9b24860bb2b55e35b4bb45fbb3af988167e39f86a5e0960
font_02_sfnt_off00011fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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