Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b6abdde6d35884a…

MALICIOUS

PDF

95.8 KB Created: 2021-05-11 22:26:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7623b90dad341e9745682b2d1ed7dbf SHA-1: 67c3e788afdbfadda2fa451590c0075d2fec9f5b SHA-256: 2b6abdde6d35884a97058f1ae5a7adbc3cb5c925fe20c0b0e09e548ae465b47f
154 Risk Score

Malware Insights

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

The file is a PDF document that has been flagged by multiple heuristics and ClamAV as malicious, specifically a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting an attempt to host malicious content or redirect users. The ML classifier also strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9704

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=captain+america+infinity+war+shield+template
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1a4cb73d4---26834431580.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9a46d6dc3---97215860960.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9de7e9ab6---bafozuxinadixom.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609038a5b705a---67630027441.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160970466c1611---fofanexeg.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ffd5a1ce7---rodosutigujoxazajuw.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607d648cc1637---18268167043.pdf
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767094a3d09---19938110702.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608fda23704d0---76045836004.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/fe55fdda0af0c964dd3118afcdcc39bd/vatolubalovalag.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160720c4937bee---biputoniminon.pdf
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/0be1013b3035533e226868175b169240/23539775783.pdf
    • http://vce34.ru/attachments/file/popizadifubajotasepa.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762e3f5620c---tisitopidaterolasutagiwex.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000155bc.bin
e01fdb94fdd311364363bb79c630fe8147d6dd74eefa968cc6d973bc4871a4f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x155BC 5492 bytes

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