Malicious PDF — malware analysis report

Static analysis result for SHA-256 971b41a1f6b62a16…

MALICIOUS

PDF

81.7 KB Created: 2021-09-24 05:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: fd14420e15f1be72784e9d43cca45f3a SHA-1: 7a3bfa3ec19ec523df0ac47f1990a5c4082cf129 SHA-256: 971b41a1f6b62a16d26c4dd28c941b65bd9d91f3affa973910b2cea1cae2da74
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on disposable or compromised domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://drafthe.ru/uplcv?utm_term=androidx+appcompat+v7 PDF link annotation
    • http://jiehuist.com/userfiles/files/surebokudopomaxagesumi.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/55fa913519af92436a618ef58e6f2fbc/jawafutezutuxulebi.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/zikuwaboburitolarekor.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/26460828060.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/lapobanidubexopidop.pdfIn PDF document text
    • https://rafautama.com/uploads/file/66475219599.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210904150337_lv4aji.pdfIn PDF document text
    • https://12shio3.com/contents/files/42600245206.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/zonorofogedemulisodeg.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddb969e16b---vezikida.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/52325176448.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/vaxenu.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/misirasetajerowomelekita.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161457d2349c74---308777336.pdfIn PDF document text
    • http://gewidor-gmbh.de/uploads/files/20271676223.pdfIn PDF document text
    • https://fptica.ru/images/file/jutotunifotukagoxolubipo.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/2021924947512055.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/68297947718.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/lirukebaxevir.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/jedanejuvanegunapuraze.pdfIn PDF document text
    • http://dsagco.com/Upload/file/bemer.pdfIn PDF document text
    • http://hansungid.com/userfiles/file/boxabizevejewuwenitor.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/13908854611.pdfIn PDF document text
    • http://e-hematologica.pl/users/file/4630736952.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_off0000dc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48C 17416 bytes
SHA-256: be2fb95b25fda59af687924ffb8d9b8140509eddb54416ac3b78c19185956782
font_02_sfnt_off000121e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E2 10528 bytes
SHA-256: 97f7bf01a7433f3f11be9f261e1d2cd1ba540118547b6991f389f3d93563e402

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