Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0cba94b978309df…

MALICIOUS

PDF

76.6 KB Created: 2021-09-03 04:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6c0cf97cd0b03a1c8bda167dda851746 SHA-1: eaaeb2a4101faf44aff0cd13eabac111403acbae SHA-256: d0cba94b978309dfb796b0050847d9fc2bda821852faff967e9214121de268fc
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It functions as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to lure users to malicious content. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27842654383.pdf In PDF document text
    • https://ckmusicdesign.nl/userfiles/file/dovejajevelasuromaxamup.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a59d92198---ruweket.pdfIn PDF document text
    • https://kaskad-74.ru/images/uploads/vageloxuzafozufufosume.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/11499848726.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/50777768201.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/lukozuvuzamunikaf.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/91bd7472ce32b515033b02e3050dc0f8/34644416743.pdfIn PDF document text
    • http://meechoktoolmart.com/user_img/files/60188763033.pdfIn PDF document text
    • http://www.ezmoving.com/file/77062214618.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/81252326551.pdfIn PDF document text
    • https://isosklo.cz./uploads/57084711077.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/a1d06c63571f24dbb70c675b582ee79c/tifodagedusurabuzilosuju.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/lavapadap.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160887ac81a35f---59096771767.pdfIn PDF document text
    • https://kildevangen.dk/files/57171464940.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c57490bb91---bukomuka.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607836aa069c6---50869013188.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/3301642650.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7e56019715---nokudopoguxokefa.pdfIn PDF document text
    • http://burrburroughsfamily.com/clients/55468/File/tafasanezeleduvo.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/bomaxarebexu.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/32952729332.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=math+154b+solving+radical+equations+worksheet+answersPDF 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_off0000c6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ded5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED5 11536 bytes
SHA-256: 74bb1151c70ea4383d86f9a354bffb9cba3a7aed3309258f5b3b63bacf29ae26
font_02_sfnt_off0000f9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D5 16308 bytes
SHA-256: 150726c1d7e945948ca7d324e9c3ba09184f2a49d4f45331fac236611117af4c

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