Malicious PDF — malware analysis report

Static analysis result for SHA-256 27bf29c3b7cc8de5…

MALICIOUS

PDF

71.5 KB Created: 2021-09-17 10:24:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dddbc024f970b2bd5fee500d709cccde SHA-1: a04b85c6547b6ca88439fec6f365da699c79398b SHA-256: 27bf29c3b7cc8de5df0c63f60f502e9b36756f71db1bbab935245d49ab68f97a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic firings indicate this is a link farm designed to redirect users, likely for phishing or to download further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://pistant.ru/uplcv?utm_term=out+365+login PDF link annotation
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/94b33a4815130eaa12ea8a2e949def48/razovawalavuxanisojas.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/wexeguninutaluvevuraval.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/80673258456.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/275522757613d194d5d5c1.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/doxulozekeguliwuzanesozup.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/86161295046.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210911_6ACEC8B1F9060DB0.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/33699626346.pdfIn PDF document text
    • https://mcsfood.com/images/file/60556532140.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/jurexokufi.pdfIn PDF document text
    • https://westhygiene.hu/editor_up/fusutematarimanewirosixud.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/todemimatisalur.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/giworobamejaludeved.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///57439617734.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/kuwunelelemevikulix.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/17042526734.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/kunujakuw.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/89451986307.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412fd57ed00---22716748097.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/gefepo.pdfIn PDF document text
    • https://seas2010.cienciaevida.pt/site/upload/file/38879794391.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/deruluwurabiz.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/48166280677.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/15dcbd88b36c4c390cebed626ebd33e4/noxonarub.pdfIn PDF document text
    • http://skncn.com/u/files/tafolekajerupudojamatiz.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/88624942057.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/89513520276.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161411094e3616---14004659444.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_off0000ba62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD279 10320 bytes
SHA-256: 34cedcca4b5e590dd88f7ae7c2b1e9ece5ea7d246733506545642d9a9fcaa194
font_02_sfnt_off0000e9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E6 15196 bytes
SHA-256: 3b82c557028d08d52fd12557dd46c4b58f94c65a155f4dcde3f90d7db3191a02

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