Malicious PDF — malware analysis report

Static analysis result for SHA-256 f865925f808083cc…

MALICIOUS

PDF

69.3 KB Created: 2021-09-07 15:23:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0922e30f14b93346f952f97bcc6caf1d SHA-1: 467a410d986602ac436225c04b5c86d60fb54789 SHA-256: f865925f808083cc2b9234e0a197c4fab89090d1f8800ba4e0a2c37fd4b920f3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on compromised websites or disposable domains. This structure suggests a link farm designed to lead users to malicious content, potentially for phishing or to download further malware. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://actinq.nl/upload/file/nobebekobepibopef.pdf In PDF document text
    • http://tks-forever.com/upload/2021/06/26/file/52170587837.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/4988237675.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f30541f34dd---gufomefevemedejevenofis.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/97881179819.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/570124053.pdfIn PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/76128144453.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16078ac5ce3cbe---fukuwexavepivewut.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a85752619---50834712162.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/fozejawubigokesudisu.pdfIn PDF document text
    • http://info56.ru/userfiles/file/valeru.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/rivabekukewewuvisigomofan.pdfIn PDF document text
    • http://baobiachau.com/luutru/files/rokobiworiwane.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/kexawolaz.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/51796240296.pdfIn PDF document text
    • https://mavibusiness.it/file/47919566172.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-6/file/dirabatujibojopujilop.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210618182148729.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/saretojazopumokibiv.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/7qti5paq30phlmupqn6cj0e0uk/wanotebepunusuwenerabode.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/462047447.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/3e0bs35pnrf9noojafq0hei098/58183724894.pdfIn PDF document text
    • http://hladonural.ru/upload_picture/44121771458.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/gelogeniwunefetowoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=pdf+converter+offline+exePDF 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_off0000b1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E2 10308 bytes
SHA-256: 382011b49c66b8cc1efc06e46ff024815a58faccca4c74d2fb33bdf44a7dec9b
font_01_sfnt_off0000c938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC938 15200 bytes
SHA-256: 37639c8f8817ab24aab5364ce2ad67cd7337ea79101ff2c6d17a91222381e346
font_02_sfnt_off0000efcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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