Malicious PDF — malware analysis report

Static analysis result for SHA-256 13468bf1ec7da399…

MALICIOUS

PDF

81.9 KB Created: 2021-09-10 10:31:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 32a86ecfc8f1b2a4caf046903e8e4414 SHA-1: 06c4309318835d01d78e8162a5042c38a460c2c1 SHA-256: 13468bf1ec7da3990b5e35c2496da86d26f1d8e03fd6d83dee359c721079c665
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure as a link farm, combined with the nature of the linked sites, points towards an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ketchas.ru/uplcv?utm_term=will+predictions+exercises+pdf PDF link annotation
    • http://beachfirebrands.com/userfiles/file/xuribub.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/namemuluxerakatagubegoz.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/66673534355.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/39623416418.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/lopewikobobawuluv.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/velesefego.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132533fa2509---lirinizeg.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/23936747633.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/75816886526.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/13880937373.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131557e706ac---46534280557.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/tozif.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/4677553625.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/gimn8qo1cm8e4vguiinfvkphhn/55390469968.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/55103199116.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/9404013980.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/25818926136.pdfIn PDF document text
    • http://electric-kernbichler.at/97691770366.pdfIn PDF document text
    • http://hkalc.com/userfiles/16847251994.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/nowodajowizoju.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/81759822631.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/sipira.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/guvax.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/janozazoto.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/tesofaxanikaladix.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_off0000d9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E5 18492 bytes
SHA-256: 5c824de9230107cb6d295c570663e83e80fdfd517c4101785e12368eb80b3954
font_01_sfnt_off000109af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C6 10548 bytes
SHA-256: c55b122470b08deae4565133bc1763699ee139eb510e4e76331ebae7224c8488