Malicious PDF — malware analysis report

Static analysis result for SHA-256 34cae759a6aaa84b…

MALICIOUS

PDF

90.4 KB Created: 2021-07-31 08:22:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 910f7f20ff2f27904eca055cfe3c70a9 SHA-1: 68b71633f3e2763cb895e858888c54e2a1db99dc SHA-256: 34cae759a6aaa84bc875dde42e2d03b757fae57bb5944e81024235290d7c476e
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to malicious websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.findvoters.com/userfiles/file/6429712788.pdf In PDF document text
    • http://amdind.com/userfiles/file/vunuzozogopiwipotulo.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/61518277624.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/0h6dlhqln8mmdno14f10t74d16/55924812832.pdfIn PDF document text
    • https://mytopics.it/uploads/file/8228627943.pdfIn PDF document text
    • http://abnicum.com/files/file/44286493996.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/vizozofali.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/puxesut.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5dffea907---kojavarogatokovubunuda.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086ab9ee3a57---30407110338.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/96884727429.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/aad366749a431708f73cbf9ad048f108/sadububotedanexojivele.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/22587683721.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd99b1a1837---tuluxezenajobetavatitujef.pdfIn PDF document text
    • http://maihome.hu/admin1/file/zafoxuga.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/zibubumadefirux.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/t10ueh61ch1q4ln3at1ttuggb1/sopotevenutozegip.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082443918162---gabumegogisozusad.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160980e50273bc---34097508125.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/22178eaebe3bbbdba442dc6b439085d4/54406429545.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/57796707203.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe569cc1c4---kejojo.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/79020988630.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/16989457765.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=ver+peliculas+completas+gratis+en+espa%C3%B1ol+latino+de+accion+estrenos+2017PDF link annotation
    • 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_off0000fc4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001145d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145D 16092 bytes
SHA-256: 1b1073c53aae2cb72c1f615356189f91f7cfa857f75534d3b46f64bdf43c1e26
font_02_sfnt_off00013d86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D86 11476 bytes
SHA-256: dfc49e506b4bf6c855774d1f751f944d60b9fd5822127742ae4473eb0fcc3b0a