Malicious PDF — malware analysis report

Static analysis result for SHA-256 638aecaf26c761d7…

MALICIOUS

PDF

84.6 KB Created: 2021-09-18 08:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e5c2d51e23902a40aabfb66b8c3c0707 SHA-1: 1f8e388cee46e3c500ebe2e53abb3d5a7a68b9a3 SHA-256: 638aecaf26c761d79ff9f8f037f5d8b10ab8d6b8fe223f597c73101d509e6a91
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting an attempt to distribute further malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The embedded JavaScript is likely used to facilitate the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://elsadaulte.com/ckfinder/userfiles/files/galimopulezulodujuvuza.pdf In PDF document text
    • http://skupka54.ru/upload/m/wilovo.pdfIn PDF document text
    • https://megatex.ua/images/uploads/file/jisowuguxatuka.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff51f56d9f---89415171565.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140580f9a4ae---pizepikodasakitonav.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/xorezuzavitigomet.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/baxetiwikoxupofizijunixu.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/10173609565.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/65282941342.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/12679333327.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/85586681479.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/846948f42ea66bddf016eb557e56551b/kizoge.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/waxexezijogi.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/bodipidanemi.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/82342062013.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/71655808182.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/65119425927.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/tegevejelokimoganav.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/pokofano.pdfIn PDF document text
    • https://mytopics.it/uploads/file/63479205360.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/17673993815.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/82768034341.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16140253cc5475---bafutovobukiwipotetax.pdfIn PDF document text
    • https://salwangurugram.com/files/rizukasinijeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=amazon+prime+video+old+versionPDF 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_off0000e27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA91 19128 bytes
SHA-256: aa62ef0d4957adc8d6697303d2026a86755598f1159662d0ac7b92def0cf6205
font_02_sfnt_off00012c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5E 10564 bytes
SHA-256: ff412c2812f3d7cbae4e74ace4ba608ae4ab81c0edc1d4e1e2bfbbefb65f330d

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