Malicious PDF — malware analysis report

Static analysis result for SHA-256 652c388f8fdf0507…

MALICIOUS

PDF

70.5 KB Created: 2021-09-01 18:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 307997fb06f40b6b19b066769bbd30f9 SHA-1: 5354a9ba6012fbe9f6dcda1e6a4d62b14cfb943e SHA-256: 652c388f8fdf0507e62fa62b62495b11536579d32d8bd6f5f8b9800098f6e67c
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URLs are indicative of a malicious document designed to lure users to external, potentially harmful, 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://pixomot.ru/uplcv?utm_term=hollencrest+middle+school PDF link annotation
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/csqlm716i0l1l3ip5j3e2k0dr2/paxogugawaberes.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/51365587708.pdfIn PDF document text
    • http://elm3rad.com/file/91324868193.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd849172c5---50155542346.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/179564e8c46b1e8bdf95b9ca68a5a610/59111343567.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/zivuwadojetemuxafa.pdfIn PDF document text
    • http://watch62.ru/files/files/93945013436.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-8-7/20210807041426887875.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/he22nrp76c7j4bfe0kni7fjrf8/81096725638.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/pimaxojalonini.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/28632125279.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/lopugeku.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/zaderazanuzemi.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b069b217bfe---76367774165.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/smp0jvbqg65c61klern54vnoi3/72667777150.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/fiwelataxaraxagivo.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160cab957298bc---21498601673.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/juwuketuxafutoselolu.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/f81cedd1e3ba9482fa534018c381781a/58164788014.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/fc28e2b4e9114fbce13f6a9bad71706e/39471988983.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607705691079b---juzixuze.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/d397d2d4079edfe58307c3f2ad243f7b/sogifolikibuvepirumofe.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/xuzewunetibonot.pdfIn PDF document text
    • http://edbiji.com/uploads/files/20210714133443_723802.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_off0000b79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB79E 10464 bytes
SHA-256: 7e463d8cb5b4db17fda0cef67ca1438f8788d8b2780247392d3e9014eb795548
font_01_sfnt_off0000cf1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72D 14932 bytes
SHA-256: 01852263e036d7d441c185ed3d88c783242fa2509dd170a776aa3871d42a3f9a