Malicious PDF — malware analysis report

Static analysis result for SHA-256 5db15a005a0418fe…

MALICIOUS

PDF

67.0 KB Created: 2021-10-01 02:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6b809cbd5798c2e2a60c20a34cae1170 SHA-1: 75115d118697f4f62eb135bba35415ed89c4ffbb SHA-256: 5db15a005a0418fea69d2c106ce3b28838e2120da01b42053f7eb9db70c3349d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and heuristics identified it as a link farm on disposable hosting and pointing to compromised CMS uploads. The presence of these links suggests an attempt to lure users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4908

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://garglob.ru/uplcv?utm_term=porn+games+for+apk PDF link annotation
    • http://3q1p.com/upload/file/210915121456609376w01pajp61ysl.pdfIn PDF document text
    • http://marketingnews.fr/images/file/21553907846.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/37230518276.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/wusalutinuse.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/42732034520.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/bukuzisufatadugax.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/68747411689.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/62423454047.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/dexosimadiriludatamiku.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109051555248968.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/rexaxipomafemenokozidut.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/578093d90nndomlf3tcih774cd/84336182072.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1613f93854430e---radajuzo.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/69246730505.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/56511596560.pdfIn PDF document text
    • http://www.first-classlogistics.com/image/upload/File/jowewasakovaba.pdfIn PDF document text
    • http://reichspfarrer.sk/file/87469856232.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/34896320605.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/39681446161.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/wotorevuw.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/43461679439.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61562474361.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/18213303826.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/29241835274.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/998fb467276b67c85e87a42eb4ac2107/15706822540.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/97921394600.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/23667997290.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_off0000b51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB51E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD35 10560 bytes
SHA-256: 5a79983733efd2363e077a5b1cd305cdb63e82e0249730c2eb258de4ad5d370c
font_02_sfnt_off0000e54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54F 14912 bytes
SHA-256: 0e569c76b2736ae4d7d72f5399581ac78d55bc0235748b70d7fd4ffe42e2c82f