Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac31d79f93716ec3…

MALICIOUS

PDF

80.4 KB Created: 2021-09-03 23:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9a8cde34f65e70a82a3614a75b065f99 SHA-1: 7647de7c5a31b513ec7070c67fc703db05908c73 SHA-256: ac31d79f93716ec3cc8fe8451e054429295354f3544b036426e8fbe7fa00739d
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and an ML classifier. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The PDF's structure and embedded links indicate an attempt to exploit users by directing them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=aristoteles+pdf+politica PDF link annotation
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae3efcc5c3---lubajelam.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b407870f1ce---xolalamonabesepa.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/39257807320.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/9678692423.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-8-7/20210807224139369429.pdfIn PDF document text
    • https://cncunse.com/d/files/38328724339.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/zewizuzavejatixisasim.pdfIn PDF document text
    • http://topliving.sk/userfiles/file/59786827253.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/n228pst4anuvi2hragq2pq5md4/91660550182.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/6b18bfacb3c1c1b76935aa512f2fb234/likowajulilerilafesasona.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/kupal.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/161135e839b3ac---25052898912.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6ac2c55e9---keketazuzed.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/30555817092.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/xezukevuzomawirub.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/55449733039.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/49n1e9g4fq5m93impu27bg1ju0/xogukawumu.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/12893826414.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/zanuluwufozixoda.pdfIn PDF document text
    • https://anfauglir.com/images/file/11173132463.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/vifudidupulu.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/tqu1c6rncesmvb77m4id6jslh9/vifutatuvurinuzipigorovu.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de20949d80---mojunepu.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_off0000d344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD344 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5B 10488 bytes
SHA-256: 23599b4bc2e5503af4915725a1bbcf5500bc9a1994170d5fde5f791f893bfb53
font_02_sfnt_off00010358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10358 18644 bytes
SHA-256: 713e94aca324800d33594aaeee467021ddbb781a605bf0e4aa64e5f7c67927c2

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