Malicious PDF — malware analysis report

Static analysis result for SHA-256 c22d1290dcb2ecd7…

MALICIOUS

PDF

69.0 KB Created: 2021-09-26 04:10:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: debd5a6acf1586e7b23ec692b9980750 SHA-1: 7ea602d76d89111dc4e50f0f1ba5a231e6ce991b SHA-256: c22d1290dcb2ecd7b593eb2549a892c3ee8a55981d5e55697afeb05000e16cbd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites. The embedded JavaScript is likely responsible for initiating the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://oniceh.ru/uplcv?utm_term=gta+san+andreas+multiplayer+apk+android PDF link annotation
    • http://verynailscm.com/user_img/file/bisogenonifubogoweda.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/a68ed4eda2f8eccd53eabc9736b522ba/limarakujiwufezabagipeb.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e2199bc873---wadupevuxun.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/65332366547.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/12511992879.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/1e326e06a112658161d9452f38b0e2ed/rarajebosizobigowu.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/nipifugu.pdfIn PDF document text
    • http://abnicum.com/files/file/jugase.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/dit5vmsipsbf8i9c24n3uiqe1e/simakofoxedinuferijawijo.pdfIn PDF document text
    • http://artepcb.com/upload/files/serizevodabudisoma.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/gafoferasuw.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/58322812106.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/ninizasapadofoguzonuvono.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/nobulivufabenesesejaduz.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/17621481940.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/nefuxitumodaxupurelenuzu.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/tgsjknrhpqoqktckopfp30rbc6/lopubakoboruwukuv.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/21982309772.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/gomixigedoxekaporobevid.pdfIn PDF document text
    • http://www.520amis.com/upload/files/wifojeviwirutezipajupi.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zewibikujunivakoju.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/zobidazag.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b88199d3d1---77768541874.pdfIn PDF document text
    • http://liyangah.com/Upload/file/5952484178.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_off0000b078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB078 10900 bytes
SHA-256: 80ce96d8b93ef53d3d8ebe10ddf2ac69507aa25249bb62c5f3eca5b6116f7f7e
font_01_sfnt_off0000c9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B4 14588 bytes
SHA-256: 4119a9ec48b08ee03cc66503545923298acae02d93fdcf99aca6ff253da6e5f4
font_02_sfnt_off0000ee83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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