Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5728ef9c5969986…

MALICIOUS

PDF

82.6 KB Created: 2021-07-14 02:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d6b5e894d445bf6ee88d0f1b6ae1eab2 SHA-1: 09751769b86bc681e34562b2a020e1cec1abf721 SHA-256: a5728ef9c5969986d6f2d3b0ad58c574d69de57b2d02a5bed7593c8a6f89f808
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URLs are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=good+laboratory+practices+guidelines+pdf PDF link annotation
    • https://onhimalayas.com/ckfinder/userfiles/files/rinibalewapuz.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/senutumosetulu.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0439cbf1ab---95225638672.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/mopolelaxofitiwub.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c08341eca06---weribesazesuxikebujez.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/88163519872.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/sepepaduzuredaliga.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/9b2adfaf3d5e60eb6315bf5ccc810265/xufipekanixuxuwajox.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/73604033841.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a7e3dd388---81651257749.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/gimitowi.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/82729249412.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16086b8ad8f7b6---luvideluvoxukonolubuko.pdfIn PDF document text
    • http://whscardinals1963.com/clients/9/9e/9e5fab02d16e7113a74bdd4e7828f974/File/xivimoluwelagikakulogejog.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/8556714445.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/pusezage.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/1fb050a7e10b64ac71d944ac7fdb4a51/zuzixowodulapijuju.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/86479724663.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784ed39a73d---mogarerexasirojivuwoseka.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1e3142048---65627567331.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/hgjv6v5q35fvrjlqh4egafl6u3/95440905329.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/jugiwuxisapafixega.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/jolujugazesidivov.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6021a8d2c---kedigoragudibonixokaronu.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16089631ead7f3---27383180962.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_off0000df5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5C 11188 bytes
SHA-256: 77b11e7f9c6e40baf454be322a2e8bdb51bb67252b189b1d99f5a9e75a8a1f08
font_01_sfnt_off0000f943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF943 16836 bytes
SHA-256: 5454f9b83be475241c24240406346f362901f46c8f9c2172b7414c6e9b0276dd
font_02_sfnt_off000124f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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