Malicious PDF — malware analysis report

Static analysis result for SHA-256 643502fc4b99b23d…

MALICIOUS

PDF

83.0 KB Created: 2021-09-06 10:17:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: d7572019b66f69d069adad3a6d18af8f SHA-1: c6e0983f77ba92b529e9df406204df31be0e02df SHA-256: 643502fc4b99b23da09706cb80415f4d57f71af53b4c33e59667435b2d211ceb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://aduanaldelvalle.com/userfiles/file/kenov.pdf In PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/57648636027.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/304748cdb4b8e28db8e43c363b322ade/11776958403.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/panevuvopebemokojomiva.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/k8fv4auhknmgk8ghph5gbg9tr0/1917834202.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d28f53c8fe---konovuxawejakifiwivotu.pdfIn PDF document text
    • http://amdind.com/userfiles/file/77042750284.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/fesavadobibogizabixugozek.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/710383b45b28608e4eabc870f4f33295/90365462975.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/rigomijukitenuriburekow.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202108281449542562.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/21114286535.pdfIn PDF document text
    • http://uni-soar.com/userfiles/file/63896871917.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb53f67b6c---50159067508.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/64168127540.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075746ae78ad---5082664537.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zagipedu.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/63336569670.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611b84e1bc386---74268788246.pdfIn PDF document text
    • http://yanartextil.com/firma/files/50151380890.pdfIn PDF document text
    • http://candientuvibra.com/images/file/febisowutisoluvukad.pdfIn PDF document text
    • http://www.puhito.hu/uploads/sorogidixoxojazixebag.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/c458ecdb60c08dbebb13dba88e0a22bf/40251800134.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/pipajevupijovetowapepoxof.pdfIn PDF document text
    • https://beaszemin.com/files/dixijobopifarekulamosepab.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/516f15786a3313663a20c6bebe886723/limajezafujemofupir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=foxit+pdf+reader+for+pc+free+downloadPDF 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_off0000db08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB08 19192 bytes
SHA-256: cd4022be683b8508c8d79c0e029cd8752ba31df42570f24d163c2e7247671990
font_01_sfnt_off00010d6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6A 10608 bytes
SHA-256: ea8882446b41e33d8d1d505b73ea39b1641bbd0704dc9439827787034a22e11b
font_02_sfnt_off000125db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1