Malicious PDF — malware analysis report

Static analysis result for SHA-256 e63c6fc3c1e83a2e…

MALICIOUS

PDF

74.4 KB Created: 2021-09-13 22:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 068259f9609d4c902c1200c0639d53e2 SHA-1: c275c47d5ac46f9c3ee1bec819dc167e00bb70af SHA-256: e63c6fc3c1e83a2e6480f79147b490fb5a57f0708ad8d47649c15480dc8d8237
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, as these are common tactics for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://rasmesafar.net/basefile/basefiles/sadipurapube.pdf In PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/namurefa.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/fexovituxagabatibewonevi.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/newagutonivatob.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/b9f04a98f2b70b910e015c862774a7e7/mipefako.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/mijusabepixatidutoxagodi.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/71939864442.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/8e8f56efc3c7a16988abef1d05832319/tafisideguzaxomoxuwux.pdfIn PDF document text
    • https://naves.cz/res/file/dagujidokipiduj.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131c9a055ec5---beribipefufurubi.pdfIn PDF document text
    • http://kahasat.cz/data/file/keborawowowipipumupasedi.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/44106504904.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16136ad51e8fe8---19009257703.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/47634302898.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba85985052---72398688253.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/46875086848.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/95212307668.pdfIn PDF document text
    • http://hb-hospital.com/file_upload/fck_upfile/file/tadawimo.pdfIn PDF document text
    • http://porpora.group/imagenes/imagenes_contenidos///sipeturivixepov.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/75031758423.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/toxasarixodat.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/zexubudukepafapufe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=kim+kardashian+hollywood+unlimited+money+and+starsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C8 10896 bytes
SHA-256: 9fd43d212f2828b90fa299fcb0177c275fa65c6b35252fee6de63615d3839dd9
font_02_sfnt_off0000f1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D5 16236 bytes
SHA-256: 942b34a442be3e1bc49bf70ae3a1dca4b20004fe763b1aafdf4de0cb0a7f309c