Malicious PDF — malware analysis report

Static analysis result for SHA-256 347dd279cbc405af…

MALICIOUS

PDF

77.6 KB Created: 2021-07-25 14:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5b17046aa4e4e18050f96f5878eb5f59 SHA-1: e6f267d044a148bc65de7e36997809c6b42c4082 SHA-256: 347dd279cbc405af0be141c5988a32aabd271918bb6e9a4e30dadcc82f4d1d85
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or trojan delivery mechanism. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7679

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 https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/9b0691c89a96c677ec80e2bb9792e147/32489129683.pdf
    • https://balajitutorial.com/admin/userfiles/file/vawoses.pdf
    • http://dui-antidote.com/images/userfiles/file/zebekunakuruvu.pdf
    • https://ppuhperspektywa.pl/files/edytor/file/50092201783.pdf
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/dobolumukomamize.pdf
    • http://michalbaryza.pl/ckfinder/userfiles/files/vumopetipedozupusuxuzenat.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/eecfb9b9dc46b0f559c8f4db8f7ce2ab/zeruzovik.pdf
    • http://kochamsushi.pl/UserFiles/file/87968424763.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/2583eeac191a32a808e173cf31f96a6d/82184253525.pdf
    • http://a-pluset.com/userfiles/42507337166.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/5d3893d24c90d0d6a9b64bc59e179d10/56188446926.pdf
    • http://pphu-joanna.pl/fckpliki/file/37890924328.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6845c65d65---girafotuko.pdf
    • http://blessingsngo.in/userfiles/files/91280751570.pdf
    • https://bacninhonline.com/webroot/img/files/19736995933.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/e1a5109803cf8c04157de5317fd10086/tapafakolipaxoso.pdf
    • https://cambodiaangkorhomestay.com/userfiles/file/26965579386.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16076da0c03425---37955843149.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8945f31031---pigojetizeziwonudeso.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bf9cea652---lijowu.pdf
    • http://dotacjedlaoze.pl/userfiles/file/wazoterimexu.pdf
    • http://mitsubishilongbien.vn/images/ckeditor/files/75414838397.pdf
    • https://avigailpekelman.com/sites/default/files/file/marejekedefanura.pdf
    • http://scarpatti.com/files/gomutoxezizezasofadedi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+create+an+invoice+in+word
    • http://s292376414.onlinehome.fr/datas/imgmail/file/66897761226.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f65a.bin
204351af35c91077e46d0a228d5f3bce973821ccf04d3fe9249e90e1b42c26ae
pdf-font-stream PDF embedded font (sfnt) at offset 0xF65A 17448 bytes
font_01_sfnt_off00012380.bin
8068167e2ca545a68aea82afa496d64bcafc3081b03fb02ec43cfa8e3e8d131e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12380 10292 bytes