Malicious PDF — malware analysis report

Static analysis result for SHA-256 8166c787fe6d375f…

MALICIOUS

PDF

64.0 KB Created: 2021-09-20 08:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 89fa4e475f7f423bdf860cd0b7192587 SHA-1: 3d1c945916b2d1620260f34042639e8f2b6b550e SHA-256: 8166c787fe6d375fbb4e00d9b31edf8ad391090f0320e38c12eb5c2c25dbf5bc
94 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDF files, many hosted on domains that appear to be compromised CMS uploads. The ML classifier also flagged this PDF as malicious. The presence of a link farm suggests an attempt to manipulate search engine results or distribute further malicious content, aligning with a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7927

Heuristics 4

  • 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://bodegaadrover.com/userfiles/imagenes/6465179978.pdf In PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/sufuxurinebukewebuto.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/41128682193.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/60315333379.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/jovigimoluguvukujekog.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/moduwipunuvobofavoruweg.pdfIn PDF document text
    • https://hyosung-gulf.com/uploads/file/5335203204.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210919134144.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/38483967896.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1c4b8d6cb---tokebevepukuburafof.pdfIn PDF document text
    • http://vattuxaydunghl.com/userfiles/file/ramuzazovoweweganates.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/zanuv.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb5f1478ec---48363118494.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/15055589588.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/95656249360.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/jekufatapovenaz.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/95496461054.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/68277514433.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/zuzepof.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/31130564079.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/16198076663.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/82r79en76rnb1b5ag0ece5r0qq/66385669298.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=download+minecraft+apk+homePDF 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_off0000c293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC293 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000daa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA5 17500 bytes
SHA-256: 5310764f166205882bbec0d330b283ba326805952a2c1e0cbc87cd9e63706ab7

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