Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd4cf58e558129d9…

MALICIOUS

PDF

86.0 KB Created: 2021-07-03 03:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 770af773851b676cd2e5d7866bb5a8c0 SHA-1: 24fbee1d5a0292360e9bb897232264cd48c42e1d SHA-256: cd4cf58e558129d99e2a573a561a7b709f88051a4e336e5a237a8626781517a6
124 Risk Score

Malware Insights

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

The file is a PDF identified by ClamAV as 'Pdf.Phishing.Trojan'. Static analysis reveals it functions as a link farm, containing numerous URLs pointing to compromised WordPress sites. These links are likely intended to lure users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier clean score 0.0115

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bef2e5a61b0---nekabikuxexerowakipa.pdf In PDF document text
    • http://autosoftware.company/autoresponders_images/files/66435529529.pdfIn PDF document text
    • https://marosme.ro/hirek/file/wikunubusixo.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/b23fd02214320b700ae092bc7838c130/98178100858.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/qr4alpi82amghkmmtc37nkaue2/34762202907.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/d0a26022d375ca477d4ce742ad77fdcb/dipejibufiwevurapawaju.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/29892462867.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/135120d2cf883e33c020b2ebbe510d93/lugawijuzuvat.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/868ce3ac98e52dab190ebf90249ed755/faxokikaronezajuribib.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/85790258864.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/d87ec7d1c8e85c6f3802db97c6c8f317/31170705404.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094deb07e895---43207626911.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/03c9f7d87768e141e4a82e8a9d28b634/15316904388.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/a6e7c90de737d2374e75dab0d353b0e4/25173056470.pdfIn PDF document text
    • http://voijin.com/userfiles/files/2564226386.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/1ea2048air5m4dmqq5a6hrt0kt/99663450286.pdfIn PDF document text
    • http://easternsheep.by/app/upload/file/tewivavezididete.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160858fbf86f06---7708676693.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/v5d36ihv8dd7jdanilpe9gkq0d/gutilozaxalomedop.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/e90e7af390aa33974c2d7f8f3ca2176b/65519297371.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/xebuboxik.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/31078943557.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/vevijekumit.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d783e586e4f---joreg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=tab+paranoid+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_off0000f7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F1 17248 bytes
SHA-256: c6f71f79ac515501652a41c1e3401ffe238082e8600e08b6925118773dca403c
font_01_sfnt_off00012572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12572 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D89 10044 bytes
SHA-256: 921060d93f4ad9ccce0454c68bbfbf612b77e999e392ca0728a20c5c4060076b