Malicious PDF — malware analysis report

Static analysis result for SHA-256 7efd472bdd5d2825…

MALICIOUS

PDF

94.5 KB Created: 2021-07-05 01:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 11b876b19a4e710099449b07fd06a002 SHA-1: 6661efca63eb36b93de317906d635f2cfcc28564 SHA-256: 7efd472bdd5d2825b5fcdba918f826549795705bce8e4ea0a5967ac8b73e80b7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. While no scripts were directly extracted, the structure and URL patterns are indicative of a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier clean score 0.0880

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://coretry.ru/uplcv?utm_term=chow+chow+x+poodle PDF link annotation
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16089c4734c139---wuzujalajowiwudomi.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4141a3f59---goporomunemi.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/91841809538.pdfIn PDF document text
    • http://ewinghighclassof1963.com/clients/e/e4/e4cb61fc1babc639533983e887b7272d/File/putotefijutawifo.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/kijesawugesal.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780e6f37136---gizagakujufokewazuxaj.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/329acfe48bedf4195580bdd3403db452/65772313779.pdfIn PDF document text
    • http://falerisztika.hu/tmp/lexigapediminumifavimise.pdfIn PDF document text
    • https://tdsns.ru/userfiles/file/vivawagosamonelezabomitu.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cae45908b---juvatuno.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/52754997188.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/77738213820.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f51112bf0d---74176807317.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/80583385600.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/borobofopalov.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/b6a539c1395bf7d30039d76d0c64d003/dadadoxej.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/1849209537.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/6c1b75a68d060926fef303f3f3552e2c/35151985810.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bff3d0aaa8---61710628012.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/90097651086.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/puwox.pdfIn PDF document text
    • http://honda-vo.com/upload/file/wulemobomavi.pdfIn PDF document text
    • http://pcwest1980.com/clients/9/9b/9b13e9c1eb96aaf026ead536bb80a376/File/vesaxugukapigevisubunapur.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160cf01a084b7a---70196528010.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/4a34d4834c03c36f1ce67516d69b8a1f/3233175790.pdfIn PDF document text
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/padazukijotazekatum.pdfIn 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_off00011e74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E74 10108 bytes
SHA-256: 428dc5b09d0e956dde6bda3d6210b823263b81d4bb5e0ef10729972fe6e167d0
font_01_sfnt_off0001352e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1352E 16796 bytes
SHA-256: c15bd9344817ae60d9471d9ff119eabd5142ea45ccc14c6bed33af0feaffb612
font_02_sfnt_off00016095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16095 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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