Malicious PDF — malware analysis report

Static analysis result for SHA-256 da032f2c644c5c96…

MALICIOUS

PDF

79.0 KB Created: 2021-09-15 18:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 34ccebb1e2d044729da9460493a50214 SHA-1: 3acbb4a15bb63d2265b62b85562ca39f3cc3f893 SHA-256: da032f2c644c5c9657f5c74fede6dad199eaae7c6bafde885a17f6790a140696
156 Risk Score

Malware Insights

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

The file is a PDF that contains a link farm, with multiple URLs pointing to disposable hosting and compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading malware. No scripts were extracted, and the document body was unreadable, so the rationale is based on the heuristic findings and URL analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6125

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
  • 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 http://donateagift.eu/userfiles/file/sakisifevuxalavepemiwan.pdf In PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/97195f73fbec7ddd9a0e5f0f3bfd47d9/57977198358.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/83624643456.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320883617c7---xetegovejiv.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/zavepawebipozejopatadepev.pdfIn PDF document text
    • https://noventa.cz/media/files/file/32150471492.pdfIn PDF document text
    • https://kokomanis.com/contents/files/judewama.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/neniduwizowiruk.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/jifarid.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/58693429301.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/57969701006.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/vixutezexanipes.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/99121314070.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/kazufig.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/bobukus.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/9a870ce629b73dd9098b721769b6ff5f/wabibojizobupuziwufil.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/28549755516.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/fawip.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/debulofozijopibone.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder/userfiles/files/bafadorivatinomomifolelel.pdfIn PDF document text
    • http://caydinhlang.net/userfiles/image/file/depujesi.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16141513a5e907---85117005417.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/40325663751.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/jilutewok.pdfIn PDF document text
    • http://sns.hu/_user/file/59056256963.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=power+rangers+legacy+wars+apk+downloadPDF link annotation
    • 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_off0000d32c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32C 21080 bytes
SHA-256: 6794fbf6ed4252006f8b057c0d314048815e5d1dc7048322c2724902d9b45314
font_01_sfnt_off00010962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10962 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12179 10792 bytes
SHA-256: 863b0f7076f5576f8720c08741b147dd0fc177821e547aebc71444a4d0abb240