Malicious PDF — malware analysis report

Static analysis result for SHA-256 73db0ed421fac9ca…

MALICIOUS

PDF

102.7 KB Created: 2021-09-05 08:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fe65e6547cddd5e6c439c2fcf251f3f2 SHA-1: 92176bda93ba9192eb08850b9b0c5b9ef9fb7fea SHA-256: 73db0ed421fac9ca466553687b3242fb9e32a62facb72a69a1a341d360c7a80c
124 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the link farm heuristic.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2805

Heuristics 5

  • 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
  • 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://liga-stf.ru/i/upload/files/makikalawelovefanapovot.pdf In PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/55491f449f6031d009e01c17d096b751/27491139430.pdfIn PDF document text
    • http://mq-water.net/upload/fufamukubenavum.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae67f3b7f4e---63703888551.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609bcecf810b8---zuzuropibugupadibezevuk.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/cf716a54206e19b22a63648045ba53d6/zibowi.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/acfc579c0cbbf062e95aab14bd826559/gafamuwuwegizevirusedoker.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/kimula.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210804195251_t23yc2.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/89892969552.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/lajisusumosos.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/a31cfd72b9da9bed00cf4dee672b5f36/54746961973.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/46855092583.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/e8fe49f336761f53be5a54a499cc2250/funuxubufazurupetarodugu.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/68662708154.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/bakij.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/86040666240.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210609_223615.pdfIn PDF document text
    • http://pb-book.com/user_file/file/15929921516.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/maxamisogezidom.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/9326048668.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ecaa9422074---8522213351.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611ec86702279---83123453647.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=icc+cricket+world+cup+2019+match+time+table+pdf+downloadPDF 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_off00015a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A79 11548 bytes
SHA-256: 7393e316014379488fd69036a0bda32a4fb129c2b092c5f5e14ac43302666437
font_01_sfnt_off00017591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17591 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1