Malicious PDF — malware analysis report

Static analysis result for SHA-256 47f6cea0e7caed26…

MALICIOUS

PDF

74.2 KB Created: 2021-09-23 01:32:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cd84f08f29abb15a7aa1fd96ecd9bdaf SHA-1: fd0b35608cc396329d25a8a1a0ef71eb84d05d99 SHA-256: 47f6cea0e7caed268f2250c5b8201b5e4d4f6e54cc76a31cfc7c351df8f6bd0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://uniondrygoods.com/fckeditor/userfiles/file/58235316798.pdf In PDF document text
    • http://agataklimowska.pl/userfiles/file/72011424174.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148341b8140e---fegokubo.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/bd4fb17cf4e4622eecd39b73364afa39/90648324293.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/vafozekafej.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/tuxotovurodanusotusuk.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/2021962322107600.pdfIn PDF document text
    • http://airsoft1.ro/files/file/11001921979.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/60926016962.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/69172716738.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/befezomov.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/49844552533.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef8f348bc6---wowekesogat.pdfIn PDF document text
    • http://jeanchapleau.com/userfiles/file/7835461395.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/zapinaliki.pdfIn PDF document text
    • https://kawanmto.com/contents/files/6033590946.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/xogatobi.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/tojurazosinexizawamatima.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/wadikakisupiwedele.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/70346536465.pdfIn PDF document text
    • http://prompol.com/media/file/4707167579.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109140238254170.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614baaf22b66a---7182566197.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=words+with+a+and+mPDF 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_off0000bfa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA5 10416 bytes
SHA-256: 05320f6a6b31eb5e27b61325f9d8c69cf1f75356b3b4707695884c8de354c031
font_01_sfnt_off0000d70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70C 17084 bytes
SHA-256: ea94c85e4840b678ca1128ed4caedb3427561ba640300d54c61987dd35ec19ca
font_02_sfnt_off00010359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10359 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1