Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f6e2a871a8a4a28…

MALICIOUS

PDF

79.0 KB Created: 2021-09-09 10:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7cf2e5879da1659dc2e29336f3520610 SHA-1: d7c86f007d79ea1813698130e2586acc8d1d831a SHA-256: 0f6e2a871a8a4a280c8838049463af3d0c305d32356c0c098331e27f560e4cdd
156 Risk Score

Malware Insights

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

This PDF file was detected by ClamAV as a phishing trojan and flagged by an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The file's structure and the nature of the URLs indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8215

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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://anne-berger.de/sites/anne-berger.de/files/fkcfile/kigogedalulonubaxebegos.pdf In PDF document text
    • http://fmi.lu/userfiles/files/80021572198.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613286ec045da---38929447036.pdfIn PDF document text
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/powomenelajefesegepazexaf.pdfIn PDF document text
    • http://sb-78.ru/files/file/kejeze.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/45766338129.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/nifuwafubumizak.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/lezegidagig.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134b8f4b4697---87942247105.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/58104387693.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/09/file/202109050524039933.pdfIn PDF document text
    • https://airshow-bg.com/file/wesumapoxowexeseto.pdfIn PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/nifuneku.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/rewobefi.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/28935731563.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/11790647987.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/70641791246.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16137b56d2390e---74463142785.pdfIn PDF document text
    • https://icbacademy.com/upload/files/68065500165.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/47301940253.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333d9d40665---sexomopojobifamenivavebi.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/88154839750.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/bugodox.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/53744585440.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/85675892961.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=video+quality+enhancer+apkPDF 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_off0000d712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD712 10864 bytes
SHA-256: f6717e06b9e5494530be81a7fae4f5e742e4d27a5a57253a849dd4031d2f30a8
font_01_sfnt_off0000efe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F6 17888 bytes
SHA-256: 20b091193e5a819b29f52a023923d928acab8cb69d1159cf4546fe2a58d5b75a