Malicious PDF — malware analysis report

Static analysis result for SHA-256 a00b83b2b1a27bd9…

MALICIOUS

PDF

80.4 KB Created: 2021-10-03 08:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 91d93fad9ef921a0818e24632ab59bd2 SHA-1: 19caed620ed79a8dfa8b4dbbc34183a7306b50e8 SHA-256: a00b83b2b1a27bd90acc485f9ece74a529072ab450d3aecbdbf8bbae0378daf2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, some of which appear to be compromised CMS uploads, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

Heuristics 7

  • 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.
  • 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://inijariku.ugdherbal.com/ckfinder/userfiles/files/mepurizom.pdf In PDF document text
    • https://petala.gr/userfiles/file/simatek.pdfIn PDF document text
    • http://ccadl.com/files/20210921122050.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/66540186504.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202110030448091703.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/97646408276.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153ea3f7f4da---lunoxojixozet.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/24766900425.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/63252541002.pdfIn PDF document text
    • http://futiandj.ntgis.com/UploadFile/2021/09/27/file/20210927_052651_101.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/31218283337.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/dunafatiwiliri.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/26434298637.pdfIn PDF document text
    • http://rinsacars.com/files/others/29607074824.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/14732511676153850d7d549.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/31088664425.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614d9a844e439---metubasilazizibop.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a32af5aee5---latupepaxesewuragatutijes.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/kowubefeb.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/foxijabulufel.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/89676706365.pdfIn PDF document text
    • http://norilsk.torbay.ru/images/uploads/file/rupemanaf.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d473b330b4---77976795862.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=workaholics+the+nuttin+professorPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA46 10764 bytes
SHA-256: fd8f0b148a761b4508588608e5488d224789bf674d538e170de280c02222a1d2
font_01_sfnt_off0000d302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD302 19500 bytes
SHA-256: c67df93bb9e1b2a5a1301e7ea5be641c8ea961b1768d4e1af398de674b5ea0f7
font_02_sfnt_off00010488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10488 16188 bytes
SHA-256: 800554d3d6320da9c8ab21a3ad3d270f40e7a92360d7538c059d647d952d1d34
font_03_sfnt_off00011a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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