Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b5a902cf6eb0139…

MALICIOUS

PDF

74.2 KB Created: 2021-09-02 06:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d376041490d25816ca2f44352617836b SHA-1: 329d11a8bc69d70f0f5e91f298431a368c7a2d8e SHA-256: 9b5a902cf6eb013934a6a19938ce92dd29f4735ef7ebb47bb2289ffc864e665f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, hosting numerous URLs on compromised CMS uploads, likely to distribute phishing content or further malware. The PDF structure and embedded URLs suggest it's intended to be delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/24719fb9d32770e57778bead8743cf81/83071378896.pdf In PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160810465d5129---puzukapiwu.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/datojax.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/f52c2dc8294f694a1e66cf916cdee809/84842953968.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dacf125059---77300928589.pdfIn PDF document text
    • http://quadocdao.vn/uploads/files/90263902747.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/besabakur.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/d80b4fdbe86fee89496e5d21c27ff923/baramijorefexugugiloteji.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/tatulojalitamosibomudede.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/74906067794.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/fubuvekarega.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e91629be67---nepuxu.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/5851996755.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/71481133714.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a04d219472---40314212047.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e31d01def---zilegozifufadavakak.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/17684278171.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/38416561571.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/fiiav6uhe1pgj77tvfsvttgsrq/55237311053.pdfIn PDF document text
    • https://majubesar.info/contents//files/16334152927.pdfIn PDF document text
    • https://cncunse.com/d/files/13653950183.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/4296343697.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=life+givers+ministriesPDF 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_off0000c03e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC03E 10252 bytes
SHA-256: a32f7f3d41661bc6332daf798c51a22855acbd9f16d011db0349c546ce99d44d
font_01_sfnt_off0000d73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73D 17404 bytes
SHA-256: 5954f31d0a43538aff6c15d888d2a853807b91e5a4accabdc80e882f40d6cbdd
font_02_sfnt_off000103d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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