Malicious PDF — malware analysis report

Static analysis result for SHA-256 24663936f9f40022…

MALICIOUS

PDF

91.3 KB Created: 2021-09-04 07:06:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f7aae2f9427086cdf6cc324e51ea8e05 SHA-1: c5516e6b2409ec053cbc26a6bbae09fa5cf49221 SHA-256: 24663936f9f40022fa65cbf35c5b143961e7eeb301cb8b9fca1f7540696edb0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/aa7fd762d5df4bf364cab992c7697668/6069050387.pdf In PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/62869090830.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f87bb6d07d---gazudisurepiwibafa.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/seredolepipewugu.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/g1h45nbt9kuee0840bv8hee1qp/menorofaxejutuvifafe.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/suzofogufeminafuxuli.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/c6977f2c3f6ea8e339b69520f12e8fd2/75674430778.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/kosofofetu.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/55964611259.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/kofupawonuvepumijib.pdfIn PDF document text
    • http://runhouchem.com/upload/files/jitolosatox.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c8b128735---lilevovumavuveradosavos.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16106b0136a837---bakujisalenis.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/4b2710743bd40eaeb38decd113d6c6f5/61531138382.pdfIn PDF document text
    • http://texmet.pl/userimages/file/medudijotomexekaselokaw.pdfIn PDF document text
    • http://www.satunatc.ac.th/ckfinder/userfiles/files/fuwoledevunotaxuxeneneg.pdfIn PDF document text
    • https://mollis.rs//files/67801259807.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/aef5e7649f94ee9d535ac93979a9f1a6/gixeretevatov.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa5cd5fa14---rotibifagujojized.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612432836cc8d---93774151097.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/87848311393.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/34064013323.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/lakomotoze.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/33506665439.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/xexupuvipeb.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5c38d6b46---66643765283.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/fb87d89ff4273b03ac32164ac02caba6/zugudogok.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/bitovigefaxifowo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=the+art+of+multiprocessor+programming+solutions+manual+pdfPDF 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_off00010011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10011 11132 bytes
SHA-256: ed11701895d65980770eabf19b5810bbd295e12781362528b656891d5672cc6d
font_01_sfnt_off000119a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A5 17172 bytes
SHA-256: 4aaa3cbedcc54ba7656ad6d2c027577071d3d64fbdd2c59e1e7982f0951bda4f
font_02_sfnt_off0001462d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1462D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1