Malicious PDF — malware analysis report

Static analysis result for SHA-256 a370848e8a836e4b…

MALICIOUS

PDF

82.3 KB Created: 2021-08-17 10:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5a65bfcd4bd626d39a8c936d53c0e691 SHA-1: 95668e5720d68d6a58b2fdf8b70f2724bda557c1 SHA-256: a370848e8a836e4b8ff3897455a5c92fa748292a356643eb4ea6fae4b5d403d5
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it likely exploits a vulnerability or contains malicious links. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and unreadable, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea9f5d4d56---68810535951.pdf In PDF document text
    • http://alexandercdg.com/clients/36029/File/61532177857.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160edd36a8f24f---kabaf.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/migoroxixalevivuno.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/5079428446.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/pavolamisuvoz.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6571092873---wogawu.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/22479632211.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/70887397253.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/dakebulomaxidarotab.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/ed63438db4aaac7d3e6b608a89edb9e8/82963575388.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/87781461664.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a6bc9ad83---28448114854.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ac741a6c47---nowitigubepamesivi.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1610b4675e1d9b---99838534048.pdfIn PDF document text
    • http://jogforbigt.com/clients/6/61/61f7a61d17da296148a50ccd59c4a139/File/76246384402.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/nibivigumajuwew.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/61749398920.pdfIn PDF document text
    • http://wamer.org/userfiles/file/70362408438.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16099ead16b420---39719457992.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/vakolijovolorovolosel.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/salufusuxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=what+is+the+central+message+of+the+story+longing+for+lagenPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B9 10892 bytes
SHA-256: 88277ec6d4a7991eedf31d9832d5c7d201ff6d527fcb4b3d60c86b19791c9f11
font_02_sfnt_off00010dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC5 16748 bytes
SHA-256: 181937fb75cc5551cb168d095344a55d142aa2849dd2e86af0a84f72bf654a46

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