Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ca7daac8d09ca80…

MALICIOUS

PDF

97.4 KB Created: 2021-09-06 10:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3db506c108c8865e2659ab19f3974cc8 SHA-1: fe132514f59c12e285adb2da112d123244c351c8 SHA-256: 5ca7daac8d09ca804ab76bd40c2a6f35222f042c2ae5cd321dda22cddf10e01f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. The presence of embedded JavaScript (T1059.007) and a link farm pointing to multiple distinct hosts, some of which are associated with compromised CMS uploads, suggests the document is designed to lure users to malicious sites, likely as part of a phishing campaign (T1566.001). The document body was unreadable, but the heuristics strongly indicate a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sostrevalli.it/userfiles/files/11615195774.pdf In PDF document text
    • http://h-n-s.net/userfiles/file/75368068205.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9b5656842---saforupi.pdfIn PDF document text
    • http://debden.org/userfiles/file/99673529632.pdfIn PDF document text
    • http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/tifekimamunidot.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bd38c761bd6---jujotivorifexiwusegeg.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/puzefitotevimar.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/nukowodogiwarakawozufeta.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/4393286515.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/medal.pdfIn PDF document text
    • https://bursac.net/userfiles/file/jeboxujikikijim.pdfIn PDF document text
    • http://maxbrio.kr/files/files/71624894975.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/xetuzupajuku.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608e43e67cea0---wimafazefuvamasopebujis.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16088ba902b5a5---12612804715.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/13406153067.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/56584045630.pdfIn PDF document text
    • http://ave-france.com/pics/files/visozajavim.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/jasilumitizifukokidudi.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/6b5d0d47bc4991db808e7d5c686ca941/60122413297.pdfIn PDF document text
    • http://polloricowings.com/uploads/files/37031798688.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160863204e5546---radovapedujulerogujunal.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/5vo7h9t03q011tu075pcocnv93/mexusikopofur.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/24f66da9331f216f5757c69f42b0ea87/24883841928.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/xipilawokelunudomuka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=eric+metaxas+miracles+pdfPDF 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_off0001179e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012fb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB5 10644 bytes
SHA-256: 807c7a797519ab20bf74496abae7ca60e88f72ee19f31aaf0fafd50c87a0b752
font_02_sfnt_off00014819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14819 18404 bytes
SHA-256: dbce649d1009e26bee3be0063aa3480e262146be532d590c6e43c7a88d6b546e

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