Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6e030798dc3fa41…

MALICIOUS

PDF

88.9 KB Created: 2021-08-07 12:20:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a9e76a5c73a115433469dd697c2b7308 SHA-1: 15415e325564f9700574a7f9b1e94f6cb8c0f4f3 SHA-256: c6e030798dc3fa4127ca711090f93fbfa3dd1d6a851dbe5f963411aee018516b
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, directing users to multiple compromised WordPress upload directories hosting other PDF files. The presence of numerous links to disposable hosting and the use of UTM parameters suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://mclandpin.com/calisma2/files/uploads/78213894584.pdf In PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/8c1168dcac86ebd3c8639531293a9ec4/dujidep.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9298fdc20c---tijusutajorer.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/3045585429.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/v8sr5kvuquf0e8felivhlbjpt6/xezazufivijijorul.pdfIn PDF document text
    • https://fasaac.org/temp//files/pakavena.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/b18c07e5154bddc6cac124c81c466e8b/10362322835.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/cbe36823237e5343e2bca6abe5d09caa/70329365434.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1623023168.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/45038047504.pdfIn PDF document text
    • https://incense888.com/uploads//files/202108071200381261.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/vezofumokesuserixafaxalok.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/3e49a7aba2e3af3968697b84aadef1c8/lodiru.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/zefunenumurapeluf.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b831fc469f.pdfIn PDF document text
    • https://vleek.com/uploads/files/tulin.pdfIn PDF document text
    • http://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/ratotojozopokabir.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/43441525473.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/22482044335.pdfIn PDF document text
    • http://supporttmes.com/clients/2/26/2647aeee05d38019bb2ff7af4ee9f9d5/File/dugititasibiv.pdfIn PDF document text
    • http://irths.com/upload_files/files/xajabafetalalisawodapug.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160abfb82246a0---54258927641.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/xivumefifuvuzepis.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/32969675088.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=apa+7+book+examplePDF 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_off0000f719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF719 10216 bytes
SHA-256: dfef40639ec53e04d8e0a336e0e52e12c6ceade00942f345c65c44e82eb8b78f
font_01_sfnt_off00010de6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE6 17456 bytes
SHA-256: 40c66b147ae16dba228239358881492a2c2cac6173917b16ff37206725677793
font_02_sfnt_off00013bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1