Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb2f1c42b35c9f8b…

MALICIOUS

PDF

70.7 KB Created: 2021-09-24 14:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f22b7f71855d8216de547d8f0cae6a08 SHA-1: 33c6bc562ba8065bdb73942376ee865c9954485e SHA-256: bb2f1c42b35c9f8ba402255d4ec8e651f58b2b9c351d12d5a88aa1c06f669e0a
124 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to compromised or disposable hosting domains. The ClamAV detection 'Pdf.Phishing.Trojan' and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest a phishing or malware distribution intent. The file's structure as a link farm indicates it is designed to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3973

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://daltan.hu/userfiles/file/26703122832.pdf In PDF document text
    • http://asztalosweb.hu/userfiles/file/sidotupigivofojewo.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210915/file/58390881804.pdfIn PDF document text
    • https://kawanmto.net/contents/files/51713797705.pdfIn PDF document text
    • http://vrtaspol.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/tanarumiguwuxatuzi.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/kusimopakabo.pdfIn PDF document text
    • http://demo-jesma.shopcloud.es/ckfinder/userfiles/files/xiwegenirarolasufuraze.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/zivizunigex.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/riloviz.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/60766108189.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141892f32f78---62706842147.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/bepagudugomiwujajibizutaf.pdfIn PDF document text
    • https://coil.hk/upload/files/zebas.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/a9bf1dc093ba3edc633cb6029284b5b9/69598629878.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/64aa3e87209edab0e70964699d81a14e/bikize.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/zusazejuvusofifen.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/12120811285.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/nutabipu.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/27134623769.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/gexezamo.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/felirifegutefejigog.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/widowivamejetadimepemug.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/69684139885.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/liminoralevenesasikivuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=avatar+cho+androidPDF link annotation
    • 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_off0000ba29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD240 10168 bytes
SHA-256: 3d1e35cc845cbe3fc00a5193dbb9533345087a1ac8f069621a38a6a3e99cc66e
font_02_sfnt_off0000e8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F5 21812 bytes
SHA-256: 37773807d7bea04a4c8ec505fb8e4b5e91a42a8b0f8f9d55d5972418a5ee0417