Malicious PDF — malware analysis report

Static analysis result for SHA-256 102ba9a4abfaf57f…

MALICIOUS

PDF

71.5 KB Created: 2021-10-13 17:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c8b2b7cf57a1ee2f6f124ebb301408c2 SHA-1: 512c149172f940af5083917197bbb85e24eb1b7a SHA-256: 102ba9a4abfaf57fc9d196a0199ea90becc36bba107c50b15d0b8ba448c6ca78
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://idd.no/ckfinder/userfiles/files/jalalugukisapebuvepitav.pdf In PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616350caa05fb---79204331118.pdfIn PDF document text
    • http://falcon.dk/sites/default/files/webfm/jagirejowesuxe.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210920235006.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/noxirubupekofafelujusadi.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/60566984201.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/95926071143.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/gijobibapower.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/mupidorutoxipofisiwe.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0910137001632436459.pdfIn PDF document text
    • https://toscanafantastica.com/userfiles/file/biselu.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/88653516997.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/bezutidalulojonozokazo.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/fimoboxiwavizozeken.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/88773283347.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/derifomumogugojal.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/niwugominuxidibexaxovow.pdfIn PDF document text
    • http://agavietnam.com/img/files/zitelelum.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/jexukevomobulixezumap.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/32817581513.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/76466905351.pdfIn PDF document text
    • https://unosms.us/userfiles/file/34902119143.pdfIn PDF document text
    • http://alituncer.net/userfiles/file/wurimufinotujegira.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/digatexuvotuv.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/50961980990.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615152ca5d495---97565621097.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424e6db02e4---ziwozijebujorimidamuruwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/xPAns0MRe5M/uplcv?utm_term=110+lbs+to+kgPDF 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_off0000b729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB729 16720 bytes
SHA-256: 57795c1d39470d81035cd24c6349e6fe5a9aa6ae4d084df7022871fbe3ef9dd5
font_01_sfnt_off0000e1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA02 10000 bytes
SHA-256: 8d62bee2dbad9e4829fc557881113b614ea314ceac8ab9a820929b9acebe9f21

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