Malicious PDF — malware analysis report

Static analysis result for SHA-256 808e7a760b35eb67…

MALICIOUS

PDF

74.2 KB Created: 2021-07-26 00:09:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 81c790b854e524fd8d499fb3040d0e08 SHA-1: 60d9cb414f5063095d735e6cb5fdf072dba57e98 SHA-256: 808e7a760b35eb67b45604a22f6d1e514c41098c466bcdec84ccde6fbae55413
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The presence of these links aligns with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://jwnorthclassof70reunion.com/clients/c/c6/c6167e942b76adab5863fbee8ae727a7/File/28870842709.pdf In PDF document text
    • http://panziofabian.hu/fck_kepek/60699980107.pdfIn PDF document text
    • http://acgroupenterprise.com/userfiles/file/jafoxibezuk.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/842d06bb981bf63a71a12fe66d1758ad/87036264371.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/12887699856.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9b536648c---rojuvuxadirufizefemibiwi.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/79064173079.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/berugetajav.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/66141056794.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/b5hfvtedsivqnj3eku52jd2001/bixekavivexav.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160922bea8ff5f---61529390939.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/50596192675.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7ld4uc0k5ndq810877n9amthf6/12697839630.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/32230169239.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/13636208196.pdfIn PDF document text
    • https://solo-enoant.com/content/files/files/87815107744.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/36489582795.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160962ce616ab2---pegexurirunewat.pdfIn PDF document text
    • https://computerzone.pk/file/48011931235.pdfIn PDF document text
    • http://ciskmv.com/css/file/jinibumerefivewofojogop.pdfIn PDF document text
    • http://ozkayalarlojistik.com/userfiles/file/48978230644.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/segorunelodope.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd3f587c1d---jategesidakuv.pdfIn PDF document text
    • https://thietbidienmanhcuong.com/upload/files/33443963747.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=kpss+orta%C3%B6%C4%9Fretim+temel+kavramlar+%C3%A7%C4%B1km%C4%B1%C5%9F+sorularPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3f58db2a7---95314133744.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_off0000bc12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC12 11492 bytes
SHA-256: 745daf3ae53537a3d30e939342991d639cdb71a720fa4456c1352f1e62c6e809
font_01_sfnt_off0000d644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD644 17200 bytes
SHA-256: 51905be16390bd4943868226515283eeefd833d607106f9e2ff8039717502f48
font_02_sfnt_off00010047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10047 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1