Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d98677b808d1c61…

MALICIOUS

PDF

70.2 KB Created: 2021-09-27 14:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c8b5ef0f0359b49bf18a96e2f6e0223d SHA-1: f33e82a1606dadd347f2dca5648c6eadd9cea05c SHA-256: 7d98677b808d1c6168edc2095c9babf4e449410aa3a3af76346860a8c6a6b933
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious content or downloads. The presence of external URIs and the ML classifier's high confidence score further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://irlanc.ru/uplcv?utm_term=mcpe+latest+version+download PDF link annotation
    • http://animationcoach.com/userfiles/file/jedipipobe.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/4576127116.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/lumeduvadeseb.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/95431086954.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/balobabikokakagotojuvasem.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/22714990877.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/2c8cde681d677bb52313b75ce7b5c35b/99346084171.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/87449832351.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/zejijunozan.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/51062260965.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/65038999975.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109100603377733.pdfIn PDF document text
    • https://mmszke.hu/files/file/zepagawemejafop.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/73393944889.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f421b9eda9---77081971057.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/dodivakatuni.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615145c50ba92---nimugunudorotir.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/paxumatanokuzojitefidoso.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/a8cad571be2445588f60419a1d835b0c/xiremokisisufudul.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61730767586.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/99347258039.pdfIn PDF document text
    • http://audiohrestomatiya.ru/content/file/20764044798.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614553c003314---gemipedubikudegadamu.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/c7e22a476c19248d038d2c1b7addb8a5/makorofewipotazuwiluta.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/rebojokelifiziliper.pdfIn PDF document text
    • http://budget-pl.com/ckfinder/userfiles/files/pumevorazore.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_off0000b303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB303 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB15 15816 bytes
SHA-256: 273364f36bebe1f2a7b5357743d767fe651b0362cd0bca38ca32ce69c6a5fc35
font_02_sfnt_off0000f296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF296 10652 bytes
SHA-256: bcd4fc6ce0bf2dfeed3b6ee6ec05e53ff3101f3e04490bb0714f5f7f58380b7a

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