Malicious PDF — malware analysis report

Static analysis result for SHA-256 347e5dd99b2afaed…

MALICIOUS

PDF

83.8 KB Created: 2021-09-02 10:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: caa50fa211e588a61dc53dfdcede3ad7 SHA-1: f3034f31c1519cfe6fb3d9949e017dbc38f1fd0e SHA-256: 347e5dd99b2afaedbfbf5c6334f7160109a7c8e872041a1471cc7ab7150351c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to external websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded URLs and the structure of the PDF suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://medvor.ru/uplcv?utm_term=at%26t+cl2939+user+manual PDF link annotation
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f4ed7e333---88651141907.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16087495e91b38---fotawiduvatuvivi.pdfIn PDF document text
    • http://colescastle.com/clients/875019/File/90144450995.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/12102276873.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/kiroxuji.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/66358281531.pdfIn PDF document text
    • http://yuli-china.ru/d/files/xukojepix.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608470a08ff67---naguleteralizavoxub.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/nagifirovil.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7102715b9---24328620258.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af6bc0a2480---bawufof.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/newesuwasaziteronuvu.pdfIn PDF document text
    • http://jaika.in/images/documents/files/73274960874.pdfIn PDF document text
    • http://altinay-law.com/images/file/9489919169.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/99910862078.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/pejegetukum.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/belojuwaxededibod.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/biwofadole.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/gutebasewufovagedafozo.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/4cea7657de3570a4bac3fb8d22ea2a3a/zuzazezuguwilavanukodif.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/vajagepemudi.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609006b02b02a---20262270769.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/5ceb02604de64e7ca91c3924cbe86f28/73439401886.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_off0000da19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA19 23004 bytes
SHA-256: c81d8af693191efee4c2188e51c96775a9c24ee2c473a3930b65a57b882d0e39
font_01_sfnt_off000115e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E9 9152 bytes
SHA-256: 1fa3688a0d12ad52ca2dabd88ce5fb3a0123a126ab25e17ba9d917f6df84f51b
font_02_sfnt_off000128f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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