Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c80e0ffa1c2d782…

MALICIOUS

PDF

89.9 KB Created: 2021-09-02 01:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dc65a872ca5d8e609e7546ba20096f14 SHA-1: cb8f1005a9cb01d3840a1a8d91a050b43d2c2524 SHA-256: 4c80e0ffa1c2d782d2d341f787c87857540a8a13d9d3e9b901bedbbfc3cd409d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to external sites, some of which are hosted on compromised CMS platforms or disposable domains. The presence of embedded URLs and the nature of the heuristic firings suggest an attempt to lure users to malicious content, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crysiq.ru/uplcv?utm_term=thought+stopping+techniques+for+anger PDF link annotation
    • http://bulk-supplies.com/userfiles/file/87249230455.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096cb2926a37---femabijuzekusitiv.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/jilexisage.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/ukhod169pu4vkauhp9tgdpunma/29538788330.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607de065e7382---didiv.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/13685299071.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/31031670429.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cd106a4a62d---10951002506.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/84130263873.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/31267893153.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/bidefopako.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782747a082b---damimuvetekuzukoli.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/77248187439.pdfIn PDF document text
    • http://techbis.pl/files/file/14502510914.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/rolomek.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/qmck9lir3norrsh0t9d1k68ptm/63044290053.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/muzokadelujagukekusuvu.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/pawatogikosijunomo.pdfIn PDF document text
    • http://overtonnation.com/clients/f/f9/f97855507a39dfa58978186db9bff07a/File/72231199314.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/a3237a988c43a0abd7d430992eb9d838/64728817299.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4e34738c5---16245084933.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/wojamiletibazapofodezi.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/36162150910.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/ec3301a24cb794c330f56d5553a6ab29/votekotategowufudujudafi.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612698e22665f---32372691348.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_off0000f9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EE 10924 bytes
SHA-256: bc52a16d597667d928774926578ecb4fa79347509286ddf96eead8b3afa5b5f6
font_02_sfnt_off00012ae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE9 17788 bytes
SHA-256: f9e47b267ae967c8062b5ee8bd54e742586a82e78f335d89bfa57208c91d7897

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