Malicious PDF — malware analysis report

Static analysis result for SHA-256 d31a557f47f938c3…

MALICIOUS

PDF

77.9 KB Created: 2021-10-17 02:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0ee785a8e6f025e52b35a9819cc38809 SHA-1: dcfc6f086bdef2a3e3bb12fe2c0a8ea0613dacc6 SHA-256: d31a557f47f938c3691fa65d6851205f948eade6f7c037c4850a4e4193b3bb19
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 point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/a7673ff84340ce2bf7c9bf600de8e6dd/tetukolet.pdf In PDF document text
    • http://vektor-bezpeki.com/userfiles/files/94697234988.pdfIn PDF document text
    • http://countryclaim.cz/userfiles/file/31933580722.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/tuzajevemosutofikojolow.pdfIn PDF document text
    • https://pu.vienhung.com/webroot/img/files/43424692391.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021092713295273499.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/numevolisinudigirujaxa.pdfIn PDF document text
    • http://krokodilok.hu/_user/file/57002149313.pdfIn PDF document text
    • http://gestioniarmatoriali.it/pabemomigobebo.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/48631525213.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/7754793878.pdfIn PDF document text
    • http://hiddengemsbookstore.com/userfiles/file/bukemixozatenudamap.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/80688040228.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/dudanosawesemelomev.pdfIn PDF document text
    • https://eniedu.com/data/file/20210928211715.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/bizinelugagazat.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/poremelo.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/64765408642.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/toleromikumaxo.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16169c58acfb3c---73511058673.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cf3d4e8d12---tajufe.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/3390502435.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16138be6558dda---mosumomawun.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/1hHberoKktI/uplcv?utm_term=north+featherstone+junior+and+infants+schoolPDF 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_off0000cb1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1A 10780 bytes
SHA-256: 242450bf10313100713fcf548db945cd89c69177fdccbf8514b07ea1350e988e
font_01_sfnt_off0000e3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CF 17564 bytes
SHA-256: 31e878ff0aa03be843eb670c73a25971d03b82a5f88fd46f3bf0c6532e31f556
font_02_sfnt_off000111e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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