Malicious PDF — malware analysis report

Static analysis result for SHA-256 24f64779bb2029ec…

MALICIOUS

PDF

77.9 KB Created: 2021-09-19 04:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2a6155497d233ad3da3d50be04a6e22d SHA-1: e5d38b5f6019fa71e791ae08316a0f984bba69d0 SHA-256: 24f64779bb2029ec06a3d5e768782f162e2bcb8d771f2c78e4b69c2ec955ab50
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm hosted on disposable domains, a common tactic for distributing malware. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a method to evade initial scanning. ClamAV detection and ML classification confirm the malicious nature of the PDF, suggesting it's a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://x-site.by/upload/editor/files/47032924897.pdf In PDF document text
    • https://tecnomatec.cl/upload/file/13384984901.pdfIn PDF document text
    • http://snailgame.ru/upload/files/20210907150833.pdfIn PDF document text
    • http://tabletopad.com/images/file/75828168393.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/63246014367.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/vikajokinisib.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/bomowufexebomoveno.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/23262887774.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/zerubijusidoxufikepuwaluz.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/161467bd53e407---37314154819.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/51559187735.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/84711626255.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/diluwagipowofuvamufovi.pdfIn PDF document text
    • http://millecolori.it/images/file/nawomebig.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417f0f4f3ea---69499616346.pdfIn PDF document text
    • https://huanghecables.com/d/files/rolerikokavubegufuvi.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/93097403816.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0de4059ae---85014859469.pdfIn PDF document text
    • http://graczeonline.pl/userfiles/file/dedodisatopopulivuputon.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/54179309606.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/97935692114.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613662c6dcc72---60099151972.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=gta+san+andreas+zip+file+download+androidPDF 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_off0000cbdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDC 10676 bytes
SHA-256: 105f964fbb898c34bf7693ab99fefe4464217d8f0fa621d174a15f1d9b71b748
font_01_sfnt_off0000e48b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48B 17524 bytes
SHA-256: 39d2550c0c181b28b7bb15f9e396a488fbed03c783a4e24597a460672a17e5a7
font_02_sfnt_off0001116a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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