Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f3fd430d5d81a69…

MALICIOUS

PDF

73.8 KB Created: 2021-09-04 01:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bc59a4dd0dfa8f3e74e6a7695e2013c7 SHA-1: 33d443388e508cec87755dfeba75a19458b6b8fe SHA-256: 4f3fd430d5d81a6980ba29ebb1caf79de2f543bdbaeb6c058df37fafb8c01682
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, but the heuristic firings confirm the presence of external URIs and link farms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://doellefjelde-mussemarked.dk/images/newsmail/file/xababevasusaguno.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1eea248774---devoxesaxogudobiba.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a571059e3---10325891318.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/92607944683.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/wosum.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/papirudenekidegovumuvod.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/novokomefovotudosibu.pdfIn PDF document text
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/55989905157.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/52d59a930cac62ee2de61bd0c6a4c179/77636183183.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b096aee0121---78479968861.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/42907dc306f65f5b398568d3d83f644d/28502970134.pdfIn PDF document text
    • http://prograsifkalip.com/files/54840393257.pdfIn PDF document text
    • https://ratosatu.com/contents/files/damopozasejomewurofomij.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/5660496909.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/82037462353.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/21833808616.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb91534cf4---rijapepebiduzaxiwomo.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/taxovuge.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608063ef14b13---38462159734.pdfIn PDF document text
    • https://khogiaydantuonghanquoc.com/images/news/file/70670342377.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/1e1fdb04db4c49455307a4b5dcfc7166/18663265049.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=lbb+1935%2F20+user+manualPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/0a412713d1e816c6321e8020e43e3da3/zunuj.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_off0000bb89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A0 10956 bytes
SHA-256: 4bb6c104b672bba84926af21a81391370a9b154acc7178927778edeb5345e6a3
font_02_sfnt_off0000ed30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED30 17376 bytes
SHA-256: 8392464a26826f88353a264a9f3fad99266cf277453faf555486d73eb380b94d

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