Malicious PDF — malware analysis report

Static analysis result for SHA-256 09f33e1c13d5d983…

MALICIOUS

PDF

62.5 KB Created: 2021-06-19 04:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 67b8227d83978546eb1198a2d96e20a0 SHA-1: e62f058c6f8c591ce64944bc792b80b3eb7fc7b2 SHA-256: 09f33e1c13d5d983c3e808d140046dae3b6f974219e6e97e2d67b6195f97c295
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to a variety of domains, many of which are associated with compromised content management systems or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or to serve further malicious content. The presence of multiple external links suggests an attempt to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7768

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://chcial.ru/uplcv?utm_term=virologia+medica+manuel+vargas+pdf
    • http://ncdesign.it/userfiles/files/41775944557.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d16350b743---zubekivoguxad.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d09363152e---lotinowigiborepi.pdf
    • https://europartner2.pl/uploads/bezububozebilu.pdf
    • http://vinmexindia.com/uploads/balomezuvepinupadusugez.pdf
    • http://bagumul.com/file_upload/spaw_upload/file/20210507084157.pdf
    • http://mfcwestenkwartier.nl/beta/userfiles/file/58728990309.pdf
    • https://blokhol.com/upload/files/43334930694.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/oaeik5sg1q8avndddpm62q9dcm/24725142164.pdf
    • http://hondasushi.com/uploads/files/dutifugajufotoxi.pdf
    • http://akgikorea.com/file_upload/fck_upfile/file/pukutuguxiluperawub.pdf
    • http://forter.vn/hinhanh/file/13428311511.pdf
    • http://fatamorgana.fr/uploads/assets/file/63719820627.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/ca26a8cda5f5e9b15dbe1a38e95479d4/40462256865.pdf
    • https://usssecuritate.ro/userfiles/file/gasurogo.pdf
    • https://istocdukkan.com/userfiles/files/91619151811.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b56f.bin
13b3400db8aa9bd0e8fe29169d8719497deef5994bd965b8f255e76b989a7b20		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB56F 5300 bytes
font_01_sfnt_off0000c75f.bin
1bf39c3e303f97559df5f74204755eb03ffa3f3d3fb8e0068ba8e0e064aee63c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC75F 11864 bytes
font_02_sfnt_off0000ed8b.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED8B 4324 bytes

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