Malicious PDF — malware analysis report

Static analysis result for SHA-256 756540b87ff615a6…

MALICIOUS

PDF

84.9 KB Created: 2021-08-08 13:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 57116398cd1c9e0e33b66ff0c046f1b5 SHA-1: 6bd3412dc17895c163e4367279a22be45a78423b SHA-256: 756540b87ff615a69d1c63293da16f14232b023d3ca97c841d86b5a9e14b7a87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URLs that form a link farm, a common tactic for distributing phishing content or redirecting users to malicious sites. Heuristics indicate these links are hosted on disposable or compromised domains, suggesting an intent to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://oniceh.ru/uplcv?utm_term=livro+de+patologia+robbins+pdf+download PDF link annotation
    • https://palcev.ru/userfiles/file/rezezudonajenesivovoxone.pdfIn PDF document text
    • http://klpa.net/userData/board/file/masedetusivosojodijuxa.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/gejukiganoxajoxisaki.pdfIn PDF document text
    • http://sciattella.net/images/file/gunisejexam.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102db59b9512---77205809884.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/80c7f14f6069989cc91295f42643eb85/ralajesipizefajalozofi.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/76023571350.pdfIn PDF document text
    • https://vayoto.vn/userfiles/file/kevuwiwitisepizipizuj.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/denebuk.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/jotakajomivo.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/gikekozebiroxavomozeno.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/sb14uavusd4ldg3bebhd0kcl41/58150696444.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bad13f94c9b---63434635799.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3a42c587d---42742676860.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/d90fc832a23355416a4b573186ada7b4/tubofijenugek.pdfIn PDF document text
    • https://inifd.london/uploads/file/merobodawabeda.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/xifomewimarufulonemusadaj.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/lobazajiforefofeguzux.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/16460863300.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4edc5543a---61497936863.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb15b054f8---73373049170.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/67817576405.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e788cd667---7379213715.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0355342001619816607.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_off0000e203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE203 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA15 19416 bytes
SHA-256: d0140fc8648c363099a30a90cbe88301e0c4985fc7a54b72f3ad9b78545e2240
font_02_sfnt_off00012a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A05 10920 bytes
SHA-256: fc42dcd5077748803c9f1024e4cba9a2ec3c2d6413f986170a579022078f09de

Open this report in the interactive analyzer, or submit your own file for analysis.