Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ca4e3a908990384…

MALICIOUS

PDF

82.6 KB Created: 2021-09-01 22:33:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bbb26a51c2d899a0dedd69b8ad387256 SHA-1: 352cbc826e8b56ec2c8b2ef140b57b786e4a2218 SHA-256: 9ca4e3a90899038494950b2a5ea7a3484f4e3a117f9b3f552ce7ac47b4554629
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm with 30 distinct links spread across 27 hosts, many of which appear to be compromised WordPress installations or disposable hosting. The primary URL, https://irlanc.ru/uplcv?utm_term=fan+made+sonic+games, suggests a lure related to gaming, potentially leading to phishing or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://irlanc.ru/uplcv?utm_term=fan+made+sonic+games PDF link annotation
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16121df8173987---4901753036.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/69408414971.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/viresowibewa.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/13594022491.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/92889129145.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160d776e1c6b3c---94572864237.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b8cae4d60---sujegafalorivulerir.pdfIn PDF document text
    • http://swissies.lt/ckfinder/userfiles/files/nilabajazuva.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfff2149bc---41385417489.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608156c1c1169---75971983314.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749e8005a61---11424825489.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/0651jfsfsu5l8fdnsha8i10ish/76100734492.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/63379103694.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/bijit.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/81887394771.pdfIn PDF document text
    • http://uco-kampen.com/media/files/dutusin.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/pugujufezuwito.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/19037802296.pdfIn PDF document text
    • https://inks.bg/userfiles/file/wupamevusonupab.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/fufekope.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/f2i31flgqj6vm1cr5uo2aimid3/25553372180.pdfIn PDF document text
    • http://progetec.org/userfiles/files/20648392618.pdfIn PDF document text
    • https://music-group-store.com/upload/files/26826296070.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/5853a93fd24354e4ba70fc2b2f1dfe49/fodofapol.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/gilipup.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210810_E5AE40460E16ADF9.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/29610b5b6915539de99f8465f0b64168/wanapi.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_off0000e042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE042 10444 bytes
SHA-256: 18b9a4087bdce25ec8d4dd1a2b29df19e3ba767d7d70edb2ef3240a100616512
font_01_sfnt_off0000f7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBC 16920 bytes
SHA-256: 5b4ab5ebdf20b4e8095637f3fddfc6871da0bfbf58a0d1e8b25d2f861745438c

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