Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c5a3494856b5749…

MALICIOUS

PDF

80.3 KB Created: 2021-09-27 08:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 48916b6c17053c0e1b639213c1e22e8b SHA-1: 3fda1514ef70d1db1c1348b3d2975dea4d30fc44 SHA-256: 9c5a3494856b57498644284d3d08b93e01ddec9ec2691ef9b80f73ad290444c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to disposable hosting or compromised CMS uploads, suggesting an attempt to lure users to external sites. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://kmsenior.org/file/files/limujuloxupo.pdf In PDF document text
    • http://agcslohian.com/userfiles/file/85362237162.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/womegomi.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1f21ec496---62354907716.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/7969534868.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/redofisipi.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/katujejikorununeleko.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/b95328ccb329a2d26b729d4ec9b6c97a/33709107598.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210902061838.pdfIn PDF document text
    • http://aurangabadptti.com/ckeditor/ckfinder/userfiles/files/tawisokumenobamatezufil.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/4472989988.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/33246177453.pdfIn PDF document text
    • http://adria-ex.com/images/blog/file/58754653984.pdfIn PDF document text
    • https://jck.ro/userfiles/file/zigafezewovolumabutizug.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/lv573molrs7o3d7dotqm31jaj4/favitapujonowebeforuw.pdfIn PDF document text
    • http://thoitranglani.com/upload/files/zavofi.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352601613fa---83363331679.pdfIn PDF document text
    • http://mhzsolutionz.com/userfiles/file/sineguwagubagakifeb.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/96092290729.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613de3c9da950---72801511969.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/96832196812.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/rotodaxagemam.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/juvalefatugenaxotovepidoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=wrong+turn+part+6+full+movie+downloadPDF 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_off0000c567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC567 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD79 23012 bytes
SHA-256: 53e32340e62013fff3f923d74efdcabfc6aad78e1536310dcca71927e392c83e
font_02_sfnt_off000119a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A0 11088 bytes
SHA-256: f5e88ad2e883c065d9486a35648c75aaa07f15b1cb7c43039748b45712a9714e

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