Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9d2c8668e72679b…

MALICIOUS

PDF

74.9 KB Created: 2021-09-18 15:32:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a8805fcfde482b3779e447217bc6fdba SHA-1: b4490e75048ab11f127462ee03cb99c4b89aee2e SHA-256: a9d2c8668e72679bd6da6502cde0dd67cf0fac4ef309a93b7945c6f91b5b748f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or are structured as link farms with UTM parameters, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://huntic.ru/uplcv?utm_term=harry+potter+part+1+full+movie+download PDF link annotation
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614577e9ad735---57292203064.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/66817499405.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/39573305499.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropalaboralbarata.com/userfiles/file/95826993600.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67380156827.pdfIn PDF document text
    • https://khanikango.in/file/faxegosewagomep.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/tibafizizuxajij.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/tijejolilizu.pdfIn PDF document text
    • http://tataservice.it/userfiles/file/gedovoxuru.pdfIn PDF document text
    • http://hingliltd.com/userfiles/mobegeposizadezodi.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/48106090903.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/pitejigazopukafezir.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/moxuvoro.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe28384d65---87412806096.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/67449011311.pdfIn PDF document text
    • http://apicn.net/upload/files/runejibirixibutoji.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/poletoxesa.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210908184944.pdfIn PDF document text
    • http://vps73.juicy-group.com/editor_upload_image/file/favufiderujumirenoru.pdfIn PDF document text
    • https://pvcmikser.com/upload/files/55615224732.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/83298751041.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16130bd879f19c---dosesumede.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/9jromu6j0bkclq5n4mthdovel6/92487158374.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/gopuvinumolaboro.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_off0000c0f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD903 17172 bytes
SHA-256: 80569a8b6bd3413991474efc7c24ced064e6797a80cab053e13e6b6c6ada05d8
font_02_sfnt_off0001046b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046B 10900 bytes
SHA-256: ae4bad05ad6d5c8de68c996477489d5d60fa5e86cfd526e38f3572f891228402