Malicious PDF — malware analysis report

Static analysis result for SHA-256 a50d4b3b957dc82a…

MALICIOUS

PDF

86.5 KB Created: 2021-09-07 13:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 397506484d7f33f379c417de37f2f643 SHA-1: fbc6c62c409456299674d046a91e65b72a599908 SHA-256: a50d4b3b957dc82a730e6227550366069fd09a3dbccea67ddf1456c512a226ba
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to exploit users by directing them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://stelmart.ru/userfiles/file/xamobi.pdf In PDF document text
    • http://nedirajtebosnu.net/userfiles/file/judirixoli.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a029800709---50781414219.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609486e072e12---28829706397.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f5a0aadb6---46668891261.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/85114068015.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/pumafepolawotana.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/96350079130.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/d713336124073cafeeea6f92e9529ad9/68778679365.pdfIn PDF document text
    • http://jacksonreunion.org/clients/71346/File/zilevoborimel.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/fewobenobirifofujekirur.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/pipujazerevazozal.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160753519c98b4---71990621909.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/tigerabowukiwexokivejuzi.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c2cef2dbdff---33366872455.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/wuvobajibojajo.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607196a038904---ruwupa.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/kukezivitaxamokezeganuxo.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/98735121494.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/99923287127.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/21539341621.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=manual+transmission+trucks+usedPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087511b1eb53---vidileguruzudarodixezu.pdfIn PDF document text
    • 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_off0000ecfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFE 18136 bytes
SHA-256: c4a6fc97acb58f313780948e89b6e47fbe2b00e1cd80e525741716fa4c3a888e
font_01_sfnt_off00011bbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBC 10716 bytes
SHA-256: 2515d2f1baaa47de74d338bcb06f075ca3ac5ebfcafb5adc978af55d305cd85e
font_02_sfnt_off0001345b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1345B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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