Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bfe74ca8125af75…

MALICIOUS

PDF

91.4 KB Created: 2021-09-02 18:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5287733ae74eb1a1d56f1c9a25102406 SHA-1: e057186da946bdb4e5742e401468d3f88199687c SHA-256: 3bfe74ca8125af75c73a53f3fa23861ecc77e49874155b3544bda74f5c25f569
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chuaphucluong.com/uploads/image/files/nafunerozurupex.pdf In PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/80281388040.pdfIn PDF document text
    • http://greenld.com/userfiles/42100485269.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113c6efa9aa6---59283677061.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/karopoxopikuj.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/5d22d419569aea1078e32e1982523486/zefolajojevatefujumuwax.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/muvurabuzominuwogujeparur.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9b71161cd---30757459755.pdfIn PDF document text
    • https://areicon.com/images/file/46389342477.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/fopuxunigobeloxetawitor.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/28665323701.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/35300381139.pdfIn PDF document text
    • http://metall-press.ru/files/zofuliruwekivufolesepixo.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a2dfa4c55---susabujirumag.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/62fa00c8a351a71bb11b11144649be1f/95696035494.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/fawubelozazirudujodumexib.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/8gbgfsaq5qpgagd8h3jat205l3/rinirujal.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/d7d9ffb40449c6388dc65abbbd37fe73/bepugowasexulemonuxilol.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/b7867372ce049016680b2c33599f0ea6/rekugerujekevaked.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/30132852689.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/2fadaddec4c441d7b62cbaf3b6a4d0be/3088088400.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/cde1ccf7d692f24c174b58f796c42e83/sobujavo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=ennahar+journal+algerien+d%27aujourd%27hui+pdfPDF 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_off0000f54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54A 10760 bytes
SHA-256: d45425ee5299d382f05779e17b448a61864a671fa934d9ceef64099974cf30a4
font_01_sfnt_off00010d9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9E 22788 bytes
SHA-256: 76c67b4badf29322014fb28de7e82d2fcf8d9b589b5f6c99efaea30aec7d5886
font_02_sfnt_off00014798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14798 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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