Malicious PDF — malware analysis report

Static analysis result for SHA-256 b232141a90e7afc9…

MALICIOUS

PDF

82.2 KB Created: 2021-09-15 20:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 84b069ba0aff88757ef747f7de612128 SHA-1: c675ed8e322bc13a9798979da7ae95b6f10f3584 SHA-256: b232141a90e7afc941844604e085f804b4a898ecd40818421d4954204f3bf9dd
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress sites, suggesting an attempt to trick users into downloading malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely provides instructions to decrypt a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://laborke.ru/uplcv?utm_term=watch+resident+evil+vendetta+online+free PDF link annotation
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f40a70a3f4---96252057663.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/rosapomix.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/pufoxefuladabu.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/wosabiberuvesabuzikoviz.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312adc43c0e---mazix.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/dekobigebiji.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140e7d0d617d---lirusufuzigebixixasoter.pdfIn PDF document text
    • https://alebusph.centralcms.cloud/galeria/files/22096659783.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/walagibuxaxixibo.pdfIn PDF document text
    • http://chineseclothingonline.net/File/danimewixozimi.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/dh6ds642bl3va2hg8rnbala52h/58435992769.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/gexigamotogizepo.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210908_90E86FB932A76804.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/jogoxele.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/vemiriwusulupoteru.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/xipomuwazirizoviru.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/rifokin.pdfIn PDF document text
    • http://retailcop.ca/files/sonekoxerexutejunuwemajob.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/zipanebamibogix.pdfIn PDF document text
    • http://sbkf.org/files/files/sanurum.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/tinesomigevewewosezuv.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/91936538422.pdfIn PDF document text
    • https://sledovani2.gpshlidac.cz/www/userfiles/files/vedada.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/wupaxeru.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_off0000dc05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC05 18296 bytes
SHA-256: 9e4d7264d426f6c01cb50850be2c43b4e63bd03eb44ee6965af38ee97bd61740
font_01_sfnt_off00010b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0E 10632 bytes
SHA-256: 34b922af1a835721041def6c9eb90deeaef6043ecb088dc19375711e286ad9f9
font_02_sfnt_off0001235f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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