Malicious PDF — malware analysis report

Static analysis result for SHA-256 045caae3766e4ee4…

MALICIOUS

PDF

86.6 KB Created: 2021-09-05 05:37:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f501cec0c389f65a5da05d7d6fe4c56d SHA-1: 272db96e5c30b81e65b4da2aaf1fb747cb2bff6c SHA-256: 045caae3766e4ee4d343129cbc8422f97e4de1a0fb6f81f377c713ec6dc61552
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan. Static analysis revealed it contains a link farm with numerous URLs hosted on compromised CMS upload directories, suggesting a phishing or malware distribution attempt. The presence of external URIs and a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4488

Heuristics 5

  • 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
  • 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://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1606d145e3ccae---32536021113.pdf In PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/teo4tau9mife0908vuvpk9e245/bagidajogumemi.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/13482441389.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085f4b995dff---21657504029.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/boduwa.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/j81mnhd14pjebmse1tk4nj5g47/wosipukavoti.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a926cb69c65---77405818411.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/33313481804.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/gitejepewamowadaxe.pdfIn PDF document text
    • http://abpaluso.com/upload/file/39624819769.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/zopevuwolazagu.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750a8a7cd29---bafokazo.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/punufopebul.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/08/09/15665519688.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16097cbedcbf15---93220041581.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cb38bdf2d---jexer.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210620_205611.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609d34dc5fda1---46792083405.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/devuwu.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/wakozapiz.pdfIn PDF document text
    • http://hopkim.vn/upload/files/loresubawukekosoguwol.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/suvagumazemiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=double+immunodiffusion+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AF 10540 bytes
SHA-256: be1205929bf5ed04523ca697a250e4dc253e90b8184345ff63a60ca91b290b5e
font_01_sfnt_off00011b63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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