Malicious PDF — malware analysis report

Static analysis result for SHA-256 50b3fe0fd58e66bc…

MALICIOUS

PDF

67.9 KB Created: 2021-09-22 18:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1952d0a12844616494427efaa7a94c92 SHA-1: 084ae6bd79c1a65983a8fa091b56b7cced0faccc SHA-256: 50b3fe0fd58e66bccb3f113eb587787c5ff2db804486163737823a9f6debe352
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a link farm pointing to compromised WordPress uploads and other domains, indicating an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5546

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://domadoma.cz/userfiles/file/88777194165.pdf
    • https://baglab.pl/galeria/file/retik.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141130687825---7853562187.pdf
    • http://kovacsoltvaskerites.hu/images/file/15567174460.pdf
    • http://master-vin.ru/files/file/9370159120.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614574d479d03---wiboxer.pdf
    • http://kolesnikov.pro/ckfinder/userfiles/files/18462518872.pdf
    • http://rasciindia.com/firetech/ckupload/files/43475381595.pdf
    • http://aviapartner.biz/js/ckfinder/userfiles/files/28445245384.pdf
    • https://amursvoidom.ru/media/files/karivapikosevekawekimef.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/4044798bd1f5c165e1983ece4f66173c/ledajutol.pdf
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/42441872587.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140e737c1209---jexudumikikuzepupezaguni.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/h85v2q0m1c132t6jd7b90japnp/81370339509.pdf
    • http://fishngrill.iorderfoods.com/uploads/files/39331563705.pdf
    • https://argekaucuk.com/nbg/upload/files/78808936404.pdf
    • http://channelletterguide.com/ckfinder/userfiles/files/4659756946.pdf
    • http://sbcnepal.com/images/file/jerox.pdf
    • http://meuble-tunisie.com/userfiles/file/rokukekajinizad.pdf
    • http://prota.ru/upload/files/59823248721.pdf
    • http://daisytalavera.com/userfiles/files/tokuxakobizowur.pdf
    • http://realtor-madrid.com/uploades/fckeditorfile/88719019693.pdf
    • http://banglatalkies.com/dynamic-images/cms/file/nozevexerugazakamixofesan.pdf
    • https://netlandschool.cl/files/18686159269.pdf
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/kalojagigibamevelogu.pdf
    • https://austarpharma.austarchina.com/upload/files/90219167582.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=and+you+are+beautiful+in+spanish
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f57f.bin
5f507f41fc1251e1409ab38c39b89db66f97fb2a837c1bfec2ab877e7a99d354
pdf-font-stream PDF embedded font (sfnt) at offset 0xF57F 10928 bytes