Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d6a39f7d58bd2cc…

MALICIOUS

PDF

71.2 KB Created: 2021-09-24 08:10:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eebd021a8776f1c1c973e9ff016f5fe4 SHA-1: 1e0635cf65fe1b3a4c0c98ee78e403d6f6bf8784 SHA-256: 8d6a39f7d58bd2cc1b82a165d043d23d418e812c61d16af72fdf4c744f977b65
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The file's structure and embedded URLs align with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8547

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://smidgel.ru/uplcv?utm_term=is+spinach+high+in+purines
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/hmup0ci6ahcg3rb44dhroc3a85/pudituw.pdf
    • https://implant-drill.com/userfiles/file/gafofapelel.pdf
    • http://krakowska98.com/zdjecia/fck/file/65334920218.pdf
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613129edc73be---3641889549.pdf
    • http://akekaluck.com/ckfinder/userfiles/files/kumajanoxakuto.pdf
    • http://baodieptailor.com/uploads/2021-09-18/images/files/7263154829.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139d307bcef1---34936530404.pdf
    • http://www.siphonicflowmandiri.com/upload/files/segevumifumekivefibigugew.pdf
    • http://azstorestudio.com/uploads/files/83679375373.pdf
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/gilagaziveku.pdf
    • http://hkbroadwin.com/userfiles/43105099954.pdf
    • http://suliaok.com/v15/Upload/file/2021917127277079.pdf
    • http://www.zaluziemalina.cz/userfiles/file/2388693688.pdf
    • https://indirimlipin.com/calisma2/files/uploads/vexumu.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/86c6141dbf4591f5ea03cdc59dbd6c6e/54482701263.pdf
    • http://armiikrajowej36.pl/public/upload/ckfinder/userfiles/files/nibowolib.pdf
    • http://sdds.be/userfiles/file/59127328903.pdf
    • http://synowka.pl/galeria/file/bubulodepodiruza.pdf
    • http://salman-is.com/userfiles/file/75513718088.pdf
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/57303119516.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614bc385275cf---96939921604.pdf
    • http://sanarina.de/ckfinder/userfiles/files/vodekofixesegawon.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_off0000db7a.bin
3f46734aabd961d62e28a4309147a909299736dbc1f3439c43e5cd07393f411b
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7A 10440 bytes
font_01_sfnt_off0000f315.bin
b4e0899050e87a647ef771397e20cdee28358588c74fd9fbd01b4dc5a28d914b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF315 16872 bytes