Malicious PDF — malware analysis report

Static analysis result for SHA-256 2856b6c2151c5e86…

MALICIOUS

PDF

70.6 KB Created: 2021-06-28 21:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 25499227f21ea790df2d322b2f25effa SHA-1: 66449b744d336294380c47ed30d02904164cc3e8 SHA-256: 2856b6c2151c5e86e84ce7b4dbd9aed285a2f5c41667524123052d4540432f9e
124 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. ClamAV identified the file as Pdf.Phishing.Trojan, supporting the assessment that this document is malicious. The primary attack pattern involves directing users to potentially harmful sites, likely as a precursor to further compromise.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4333

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 https://poolpoint.be/uploads/file/24285632007.pdf In PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861db9d7e2a---45738186301.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/ladubivekugosominofodaz.pdfIn PDF document text
    • http://www.toptehnik.si/images/11398924160.pdfIn PDF document text
    • https://area5srl.it/file/wizozususelenowibuma.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/b97e64879b1b6438f95b42b0b618cdec/meperesinenamup.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/82840e5c1f811b360522f08a770f631a/54815840370.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccfd2d711b---maresetagep.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/28c50722913a33fd0a16bf1d72e001dc/bapijesuresiwakupigukadu.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/74875553917.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b127850123---3059289063.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/4ac15db14b1d4e616d50de1c57b22c61/36062811739.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160700838283b0---jivipabavi.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160809e5142265---xedux.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210513054932.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160991c9586cd8---80741875888.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808f80a6cfb---webuselixegelal.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f61aaa0fbe---18563695928.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a923463f6ad---99284344328.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089397628196---69622211708.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075f2a9ce57f---81351389316.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/c7d4635ccf65b168d811f25665da284c/75149090539.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/pixosewolatowow.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/fevufak.pdfIn PDF document text
    • http://thetachikappasigmaalumni.org/clients/5/56/56ac51e2ee760b54d3ff8b7d53c877b7/File/vebijakusakolatovo.pdfIn PDF document text
    • http://newo.ru/files/files/zadixoz.pdfIn PDF document text
    • http://greenbrier101.com/userimages/14642409547.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=secured+transactions+questions+and+answersPDF 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_off0000cdd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD6 10724 bytes
SHA-256: 5d4c5e95f6179eec703309f0414225fcc65789dc5cabcdfb27e31445c8142cbd
font_01_sfnt_off0000e66e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66E 17028 bytes
SHA-256: b0133e10846af5af83df70fef4389874ebc400a0a099a1fd8bb6be9da5b0afd9

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