Malicious PDF — malware analysis report

Static analysis result for SHA-256 81c2faad8e6e2f2c…

MALICIOUS

PDF

84.7 KB Created: 2021-09-13 02:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a8f1d118b9a3f9bc18fc258f43bb0de2 SHA-1: 76fd06a6078a943530c52ae16a194a63000fb822 SHA-256: 81c2faad8e6e2f2cedb4fecc5ebeb0f6e155062c81d3fd8ffd95d010651f0963
196 Risk Score

Malware Insights

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

This PDF document is classified as malicious by ML models and ClamAV, and exhibits characteristics of a social engineering lure. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document likely prompts the user to install a fake browser extension or update. The numerous embedded URLs pointing to compromised WordPress sites and disposable hosting suggest a phishing or malware distribution campaign. No scripts were extracted, but the overall pattern suggests the PDF is designed to exploit user trust to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://medvor.ru/uplcv?utm_term=disable+developer+options+chrome+android PDF link annotation
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/35ab0b8781bc93596d804f58398b87d7/gilupa.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/nuxededulosa.pdfIn PDF document text
    • https://ekransamara.ru/files/nazimuriribosutojone.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/nugepiwenuvox.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/xowaxuzuruteledezedazegi.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/5ef4736adf0773d6418940b99950ef5a/bopefajizatuwi.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137357755963---33215319882.pdfIn PDF document text
    • http://gammatradings.com/userfiles/file/145561003.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/potarituwasorikoduperivaw.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/17044266282.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/rujewiv.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f34ea7728---radezeduxisilejanijuk.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d03f9538b5---72409896921.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210903222609.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/pojejis.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613621f4909cb---6397029892.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/83900275400.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/525819923.pdfIn PDF document text
    • https://partetesal.ir/data/file/58085310383.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/43353843167.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_off0000e0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EC 19052 bytes
SHA-256: 9aa94b28a03764408a6fbc38f1d6c56bf78cedbdf779b9874460c62e236ae388
font_01_sfnt_off000113af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC6 10984 bytes
SHA-256: 1292ffcb736ee906f07eea8378703a50b89c6dbf711d3468154322c785f9f039

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