Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0572a37b912b617…

MALICIOUS

PDF

68.1 KB Created: 2021-10-03 22:33:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b6a6f121c005cbbfdb30bbf3d7dcf340 SHA-1: fc7561bba70dbb55951175da8de749935a57b5fb SHA-256: f0572a37b912b617c8cee4d97c71c5859858211c99668517e3efa48573c863f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://synerhu.ru/uplcv?utm_term=divine+protection+pathfinder PDF link annotation
    • http://pytextiles.com/userfiles/file/4022835804.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16147f76e9d852---36459120293.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/befobulepufemenosi.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109022102373658.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/riwetedapev.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/83533695869.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/ripivef.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/51867865820.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/46158652159.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/vowikatatorabikufow.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/zelijike.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/larujefasajuram.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/taxasexorebufedewafadaxer.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16135e7a28d722---4796289359.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/57094276573.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/kifoxusajujuxawugab.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613607e1149a1---kalopatibuwosudo.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ffda2478bc---93238561233.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/53075203177.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/begezepeg.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/81839734864.pdfIn PDF document text
    • http://e-hematologica.com/users/file/74029734718.pdfIn PDF document text
    • https://alpinashop.bg/files/jasuw.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/gizumuwefibez.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_off0000aed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAED9 10572 bytes
SHA-256: d7b0d45b138e49cee69749f9a6afbc8986ffab844f049170d07effb466a88d55
font_01_sfnt_off0000c6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E8 14472 bytes
SHA-256: ff2a9962a0e0e38c52654379b13b1b398807f2fc3eb4d8603b5edfceb776f7a3
font_02_sfnt_off0000eaae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1