Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecd0c72cdf70c073…

MALICIOUS

PDF

84.6 KB Created: 2021-07-07 15:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 19fc00643eb99022520277f991f62bb9 SHA-1: 263f6cc66552878f50c2d5878f88540f8016c97b SHA-256: ecd0c72cdf70c073d8a11d4ea8b76d3732c62f310662202b565fbb6c9c43e506
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, suggesting it functions as a link farm to distribute malicious content. The presence of external URIs and link farm characteristics strongly indicates an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://bjbtrh.com/files/pic/file/97857828868.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607447e3eeef9---9620785171.pdf
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/60926508465.pdf
    • https://dianthusindustrial.com/resimler/files/72089432982.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/fa6e72a245210a0c8e518d726b65bd94/89405624097.pdf
    • https://blokhol.com/upload/files/zukusoveturojunojedukoke.pdf
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/748d7057d2ced31245df74628e1ca47a/28646681357.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086b23720c68---3309342820.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ql6mku31084jbn1q86q4ake18l/96263017215.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/6ce295bc0bec7f610e0c241cdb6fb6de/98501241186.pdf
    • http://bjsprt.com/uploadfile/file///2021061403144855.pdf
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/3390b134d9a6c3e00d99b9245717235f/xizevabesejope.pdf
    • https://flour.co.uk/ckfinder/userfiles/files/dilasisev.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1606f40a00b23b---39552856404.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/3ufsoc5rtao9uj1u0psoa9n5ah/mupitilazopinijepubumo.pdf
    • http://alfavs.eu/userfiles/file/kuralumurexikafoli.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160849a5e1e774---87409101246.pdf
    • http://alessandrobelleseveterinario.eu/userfiles/files/72077710435.pdf
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/18039296987.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/757c7a9386d55868802a708cc3613510/vixuzozibakojefezugu.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/t1ds69cepoc6iqbuog3pp3e69m/dufov.pdf
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images//files/kewodajenosezirozamazekus.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608017fc06c3b---36251353443.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160aebc78c2652---57983554028.pdf
    • http://benjamin1908.com/clients/f/f4/f4560e3fe432b95d15e234f900dec36a/File/97030041030.pdf
    • http://chothuexehochiminh.com/userfiles/file/33960874173.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=introduction+for+clothing+business
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9c8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C8 16792 bytes
font_01_sfnt_off000101da.bin
6b1d539120255d157a41b331612e69333ca530aa045b3958a5e435488946238b
pdf-font-stream PDF embedded font (sfnt) at offset 0x101DA 16468 bytes
font_02_sfnt_off00012c72.bin
660c6d292154a13a83bf4c30c8fe1c7228025bbf87ce135942aa746d9cff3b29
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C72 10784 bytes