Malicious PDF — malware analysis report

Static analysis result for SHA-256 21d5458ac95bd27b…

MALICIOUS

PDF

63.8 KB Created: 2021-09-27 20:31:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: afd9bbc92c48a2594bb2c46822917eaa SHA-1: 0e11f21be6d777cd5485ce05e55dd2543a3b35cc SHA-256: 21d5458ac95bd27b61703e7689f9b1ae9dab27945a3ba6e3090f60269522520c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple disposable domains, suggesting an attempt to distribute malware or phishing content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a strategy of using numerous small, non-clustered links on disposable hosting to obscure malicious activity. The presence of compromised CMS upload links further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6298

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 http://kastely-vacduka.hu/fileok/file/febopat.pdf In PDF document text
    • http://transgusto.ch/userfiles/file/jufavobepudob.pdfIn PDF document text
    • http://machulski.com/public/file/lixatufal.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/momozevaboler.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/38220288492.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/lebipadibukirak.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gozogon.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/u3rogau8ukc0k2nakbdhuiip4h/46136473062.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/54442370805.pdfIn PDF document text
    • http://vbond.hk/editor_upload/file/83360780930.pdfIn PDF document text
    • http://rotang.net/userfiles/file/wegiwuzezobexowejasenal.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/bosekuwasa.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/3no2fpe7cicsgic1gioneujl84/bixubodumutunek.pdfIn PDF document text
    • http://elpijisystem.com/file/xilalotebula.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/duwibesapugosip.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/1781545959.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/dijipuborabemefepuvem.pdfIn PDF document text
    • http://fmdscu.net/userfiles/file/37560257591.pdfIn PDF document text
    • http://terminsk.by/pics/files/70006153022.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c502309138---40402053049.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/nilel.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/51781328973.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=fluid+mechanics+for+chemical+engineers+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD4C 11044 bytes
SHA-256: 11831d03532b6e0ba593bb1c723ed6e410db34938a49d64bca7503e6df16a3d0
font_01_sfnt_off0000c67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC67D 15660 bytes
SHA-256: 4fcf4dde29bfe95a0a08d681d80c4de0fcf80fe6cbd3d99d415c79d88da761d9

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