Malicious PDF — malware analysis report

Static analysis result for SHA-256 1232b62fa3dba742…

MALICIOUS

PDF

71.4 KB Created: 2021-10-03 02:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a7ac5d222a84f5b1e25ee4e810d47b5b SHA-1: 51a33785d94271abe2751abeaa426dc2ec901c0c SHA-256: 1232b62fa3dba74291df170c17e6ba75033bafb4b2fad1d3bf16a9e3c9a1501f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is a non-clustered link farm on disposable hosting, suggesting a tactic to manipulate search engine results or phish users. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://medvor.ru/uplcv?utm_term=general+studies+questions+and+answers+for+upsc PDF link annotation
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/gasohisd2httk4rajoqilmcq7d/dazena.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/73647039559.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/1861948220.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/disotujikixakefimitoxis.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/dafikasurukojorubozok.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a26fba2d91---pixowove.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130e95cd5ac2---wesosafazomobaduz.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/sifelebafebewuf.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc28289a0b---mimubijaxifegetuketoduxas.pdfIn PDF document text
    • http://aurora-c.jp/files/files/redajup.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/mifuzom.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/51895177002.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/gebun.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///telifebi.pdfIn PDF document text
    • http://gptools.net/userfiles/file/54583165710.pdfIn PDF document text
    • https://carlojans.com/cms/file/rirobemubibuxu.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/xepikipivixadupogogadare.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/zeluf.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210928101253.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/22305079945.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/44190428359.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/pevoxujofuweribefunopex.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/kipuloxu.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents/files/15099392021.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/zevufibusofatixeraluvubo.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_off0000b3ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3AD 16400 bytes
SHA-256: ead8c54db06e0e46de88c96d6ccec3cd506995bebf29025e73fe04a42bdbd3f0
font_01_sfnt_off0000dd66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD66 10984 bytes
SHA-256: c3ce6a6832d9cb78d5ac4d12dbb04d3774b0871ddec140502ca86c3cc646bbe7
font_02_sfnt_off0000f6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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