Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bd0b77dfb3d213b…

MALICIOUS

PDF

82.9 KB Created: 2021-09-13 09:42:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7a8b7ca8b117ac27bfc5998726c6d915 SHA-1: 7f51aed1cc528786fb6170cc2ed65b303bae5c21 SHA-256: 7bd0b77dfb3d213b12850a5d15411de68d654d80b8e1cc7dfc4a2391cf3c9b36
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a lure for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://hoangduy.vn/vn/files/62627185203.pdf In PDF document text
    • https://oldd.adventurenetbg.com/userfiles/file/zabasinil.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/wikesozukuwized.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/52237774878.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/28711539502.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb910d2744---podakuku.pdfIn PDF document text
    • http://vizcsap.hu/files/file/12440953078.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb4782dc81---mebitezuwiwelapim.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136692244bda---77003596496.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/76436819416.pdfIn PDF document text
    • https://atrax.hr/files/59049442964.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/13038173672.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/acbe899c1964b3c517852ddf0d20d222/43782212610.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/85059382814.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/kubar.pdfIn PDF document text
    • http://venkateshservices.com/uploads/52593203458.pdfIn PDF document text
    • http://domkomplekt34.ru/attachments/file/benefow.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/8187494321.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/8536628753a8ef24fd3f099862898bbc/47120882319.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/12840451518.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/8b7d411ad166c58b36673b591a60ee0a/rogemadamazinola.pdfIn PDF document text
    • https://dd-inside.de/userfile/file/rukujetep.pdfIn PDF document text
    • http://agro-partner.com/Image/files/71568266018.pdfIn PDF document text
    • http://karcannakliyat.com/userfiles/file/nubogixaveziparu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+do+i+turn+on+chat+headsPDF 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_off0000df5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF772 10600 bytes
SHA-256: df3c0ded8b98e8e3a7d7a153df8c837da863a98382d336ce70396742b31bd308
font_02_sfnt_off00010f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9F 18004 bytes
SHA-256: fc270098327947bd00a1deb722b3ac3ab578331aa750e1bccab4f8caeff3d5c7

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