Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea9eeeb20355b4c3…

MALICIOUS

PDF

95.9 KB Created: 2021-07-04 01:38:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1845778da765ce87c4258edf615e7518 SHA-1: 0e9aaf5339ef17644619873864281b4d1c9afa92 SHA-256: ea9eeeb20355b4c335bfc19cdd486103ee34e8a9d9241969d9e57b67c453ffa5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as a phishing trojan and the ML classifier indicated a high probability of maliciousness. Multiple heuristics indicate the PDF contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://paykaaluminiya.ru/ckfinder/userfiles/files/kalodevivevulenufolemowi.pdf In PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/f3a6rbsbrpgfsk50ornlusm9g3/zexiwenerurezonitijom.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607847f45e7dc---82565918072.pdfIn PDF document text
    • http://promador.pl/userfiles/file/fuvap.pdfIn PDF document text
    • https://csn-alliance.com/data/files/xajoruginemadexezisew.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210518044301784.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/kupomeninefi.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608eab16a2d91---54051582706.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/tajeranoxudugi.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607758ff2f3df---51879854255.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/86e9634135ecd91e8dc5020595bfdfa8/vizixa.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/42067155709.pdfIn PDF document text
    • http://myshopekerala.com/userfiles/file/wekitizurelikipusajawotak.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a69703d8bfa---dufisidusavitagujomete.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b882d1a02e2---jejonijinanudunojijewu.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/xuletedabawofobijav.pdfIn PDF document text
    • https://genericdiabeticteststrips.com/userfiles/files/18586494858.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/73630728923.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/1cta7v3fblln7themviokjo3fi/78204882292.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16096b2bea01e4---47368943816.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608072c18d4b6---44481015609.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/6359c56a631220354c13ecbe797d92a3/84884748802.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/3620690450.pdfIn PDF document text
    • http://kuzfarm.ru/images/file/kawuxuba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=a+midsagittal+section+of+the+body+would+pass+through+thePDF 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_off00010f0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0D 18440 bytes
SHA-256: e77af7baf5877819bc618919c91ee8f40aa1499dc83dfd965bda0ac2ffc1f4a9
font_01_sfnt_off00013f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001574c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1574C 11488 bytes
SHA-256: 42413692d1d566457883fd8b1df371aaffcfea08a808f90f210928dbac542874

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