Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec815a8aaa365db8…

MALICIOUS

PDF

81.5 KB Created: 2021-08-27 05:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: de25de074fac81142595b0c012200418 SHA-1: ea40722afa0c83bda7a71c3fbede473ce37f205e SHA-256: ec815a8aaa365db822fc790a895e20d7953cf1ef328f8b86148777947bc75fdf
164 Risk Score

Malware Insights

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

This PDF sample was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The primary attack pattern appears to be redirecting users through these links to potentially malicious destinations, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=driver+san+francisco+garage+locations+map PDF link annotation
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/dugozebifonugelasijowuj.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/c7507aaad9e342ea27886be5896924c3/93607893830.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/vinate.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/6ab4443bec09b37715bee57fe629ed6b/kitejiwirumejenizezaser.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/gulufuvibivoxakaropapo.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/93107676902.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/34328236545.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d57710a19---zudetigirijozitotoz.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/10328057484.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f277bcd4e0---raloxewegujolog.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/2154721393.pdfIn PDF document text
    • http://zjgjqmr.com/v15/Upload/file/20217201927445636.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/s96l4g3uhbpv1i7540kmjotf20/zebikeb.pdfIn PDF document text
    • https://technische-dokumentation-hoffmann.com/upload/files/vobuw.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/cfehr99t0tr6ni7ic73hoi0dk3/14864134819.pdfIn PDF document text
    • https://majubesar.org/contents//files/wixamefuranewes.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/babegavibeti.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/jixexemujivazuzez.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/19018f03fd15429aa3ff4102c6399138/fizenonelodox.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c868b454154---64697793317.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/7243d5cbb198ad31c1483ce649b4112c/47486217483.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/88626553919.pdfIn PDF document text
    • http://01host.ru/userfiles/files/ribixitet.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870deaedb4c---fugisemetejurejomi.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/55438560163.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_off0000da84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA84 10892 bytes
SHA-256: ec7eaefd8bd5b9f6c70c24d94f30919b64faae1bbc5b89dbbda507020db32e9c
font_01_sfnt_off0000f3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C7 16636 bytes
SHA-256: 8e0d45ec328a4c06a5267c43a2e57fea93a68d3ea80e04772e1b0f96a9c0378d
font_02_sfnt_off00011f48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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