Malicious PDF — malware analysis report

Static analysis result for SHA-256 f92121a0eafe5382…

MALICIOUS

PDF

79.0 KB Created: 2021-09-05 16:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1a98f7918052cbba6b755181d3a03914 SHA-1: 8a31be143a33d8c3d20be939d889e08c18863d56 SHA-256: f92121a0eafe5382153471b2f242160fb45aa95d8098b29754fc8ac76090e395
154 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on potentially compromised or disposable domains. The presence of numerous links, including one pointing to a compromised WordPress upload, suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7217

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://narcisse.sk/editor_uploads/files/95414082013.pdf In PDF document text
    • https://mayphoviet.com/media/ftp/file/mepefiseverelupatupefi.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/51985255984.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/49387005731.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/dutijabaxerareputu.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/65684140359.pdfIn PDF document text
    • https://phr4u.com/files/kojinosavasebolup.pdfIn PDF document text
    • http://it-hair.com/userfiles/45294019247.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ddeb9a1e121---45782217809.pdfIn PDF document text
    • http://dtcguild.org/clients/80367/File/fefuvabikufadusazugavax.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2363d781c---32362863714.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/kuvulojupuruvetenojolo.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/butoxosegipanitozaziwet.pdfIn PDF document text
    • http://bvsaigonbinhduong.vn/uploads/files/pikitixedakaxejava.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/kewonalul.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/rnr5i3fn9ag45f5hia3fcg27hp/sezur.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/pikoguluki.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/garuzivagotelaf.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/ecf80b546a6f13857c0248959267cfb9/75621256964.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/56574ff174b74fb2f1f9f5c7d1ba1626/zadibam.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/87623f400ab8930b5584979d18e1a56c/musozusule.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/safafijokowopifovejujaja.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/41376793094.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff6160d949---43112099737.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/82158798979.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=les+expressions+fran%C3%A7aises+courantes+et+leurs+significations+pdfPDF 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_off0000e6fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF13 11152 bytes
SHA-256: c6f8b12e0ec12db8c4ad78aba072aef063175bedb30b38b7a761446e01f6a311