Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcc6bf55457c8cc8…

MALICIOUS

PDF

142.6 KB Created: 2021-08-17 02:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f3b0a1f29360216f30770a3efc00404e SHA-1: 3e93e89a4c64e11b63549e58b2622cbeb4a84123 SHA-256: dcc6bf55457c8cc8faf8eb20790eb32d60457e6c4745961dc0f7a5a5f29f4c68
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites. These links are designed to lure users into clicking them, potentially leading to further malicious content or downloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9609

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 http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/a3d12170d71a86d59194b68a8cd70f4c/wozovanoxos.pdf In PDF document text
    • http://mega.kz/media/upload/files/57546117413.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/4ba4ce456c1df39b3d9b3e0a589f94b7/gumevujepi.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/nexikirofixuvew.pdfIn PDF document text
    • https://coluer.ir/documents/file/31035475211.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/vuhkit53bija73fkma9udpk4s3/bepipipikitaruwubosow.pdfIn PDF document text
    • http://maihome.hu/admin1/file/jidilavojoterelimatido.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/9cfd31c26718f597278ae739cbd074a7/divex.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/bedeteposazimerazamururat.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ec88ef05a---58084343675.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/si68l40mvo9e7bmqnnqfgcpcna/52771129389.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/bpaiel28dr4c3d54sbumpbcprl/64327632755.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/5215519823.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080ac0e4670d---45396821308.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/zunavorafuzopuje.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/b0396dfc5d589b137b8042ce042ec27a/vujenoma.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/dubevidabo.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4875231857---gufezigawafodi.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/ccc1fadde95f28ebd356a677e66d6ed9/bawobe.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/jikag.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/1854164843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=ejemplo+de+justificacion+de+una+tesis+pdfPDF 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_off0001d77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D77A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001ef8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EF8C 17964 bytes
SHA-256: 566bebd4bdb5355c068bae278b6468f11dfdf83f62a33e67ca611f972e05923c
font_02_sfnt_off00021d46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21D46 10896 bytes
SHA-256: a9da3df482d31871b6762e8b1bc9e4bd60c1e0d626e1c63db2e0f42976bba305