Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bef6bc1138e4e3c…

MALICIOUS

PDF

82.8 KB Created: 2021-09-11 15:12:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a5da70fbba005aebb9fda7d9c58c408d SHA-1: 183726b33678a920dcb2900b629097877b731986 SHA-256: 3bef6bc1138e4e3c7d9857dba888fe72f48811e7d152ec570328150805cd7f24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. It contains a link farm pointing to multiple compromised WordPress sites, likely serving as a distribution point for malicious content. The presence of embedded URLs and the nature of the heuristics suggest this document is part of a phishing campaign, potentially leading to further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae8890abc4---nuper.pdf In PDF document text
    • http://dopuskvsro.ru/UserFiles/xokefe.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/d4422c89aff8b59058047c800d37001c/50030896344.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/jugipeleriwugigabi.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133e89bd4e66---kaletapo.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa2b33018a---6933702754.pdfIn PDF document text
    • http://bastola.org/userfiles/file/41254113115.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/89052568004.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/98604309132.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/67525485470.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/23541708787.pdfIn PDF document text
    • http://etkenkalip.com/files/sujatiwovazajazaxib.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/s2kjokib01ud04ri8r8o47m8b5/borabulalopipulaf.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/m54vp75qtqrvpb0l2c18v6uj9i/82560824387.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109100431348833.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/41333478311.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/59841429524.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/marurekedo.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613382e040bfc---newobadituxelofi.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/1837797129.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b71e2eca43---nolumalarusowakuj.pdfIn PDF document text
    • http://soles2walk.cz/data/file/18719373222.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/kupinubunim.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16131e26f1707f---luwilosolosilakop.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/2cab63739dbb04b7229f977214a313ff/54187362407.pdfIn PDF document text
    • https://computerzone.pk/file/zelodosapisovu.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/12640737887.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=cara+hack+bandwith+wifi+dengan+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_off0000ddf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF0 17696 bytes
SHA-256: 502378f7dc6d76bf5da3850b63e788cef1899a6985cce1cdd6a3c7d03bd63940
font_01_sfnt_off00010c25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C25 10892 bytes
SHA-256: cb51a4377b31e4a8760afe88306c461338a4a591ed410a90b58f636ce59f4d39
font_02_sfnt_off00012532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12532 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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