Malicious PDF — malware analysis report

Static analysis result for SHA-256 47bc4311009730a7…

MALICIOUS

PDF

83.6 KB Created: 2021-09-10 15:31:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7239c3941704ee5f4c3f95788f136a1a SHA-1: bebc6f2bb91c137d90fbf2420aa2091451673060 SHA-256: 47bc4311009730a7c348887707f86f2c860fb677ad941a0b594464958fe8a027
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, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It functions as a link farm, directing users to numerous external websites, some of which are hosted on compromised CMS uploads or disposable domains. The presence of embedded URLs and the nature of the link farm suggest an attempt to direct users to phishing sites or potentially download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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 http://asia-test.informacittadino.net/media/files/tozugovasobapirojemo.pdf In PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/51eeac32516e4a335891deb370e9bd52/2347884553.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135b9a949206---44021787465.pdfIn PDF document text
    • https://protrialse.eu/files/files/40888635118.pdfIn PDF document text
    • https://ourguarantees.com/userfiles/file/52002569732.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/xupepagatomitiji.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210904_268EAED6B7DE24F4.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/447145c044ba85a7208ca35df0fe844d/91109018116.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/napuxetowep.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109020206253010.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/21500273475.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/vukerofigobinijesose.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/18375601661.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/39396979339.pdfIn PDF document text
    • http://askaudit.ru/price/gigolexafuribiredamilud.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/23900880635.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/votikabe.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/bugonenazosuz.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/45859769021.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613477b6a00cd---99189414540.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/62896011473.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16137a21b3422c---budapemewoxesi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=smart+led+price+in+pakistanPDF 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_off0000dff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF1 18332 bytes
SHA-256: 308c10775d6f8b788f87a9fd99649dd76e29de2db2ff213d31419c2ac67999e2
font_01_sfnt_off00011023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11023 10724 bytes
SHA-256: bf46530c7966ecbdcd92f64d7ded1c73c2c2cae3b4f572ed9170ac8b56d62754
font_02_sfnt_off000128ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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