Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2469788d02f4ed2…

MALICIOUS

PDF

76.7 KB Created: 2021-09-13 09:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 77acdaa8140e63b20dfc2e31ab7128a0 SHA-1: 48ae4dd9999c14e1afa71017d46ea08a12e302ee SHA-256: a2469788d02f4ed275e9ff7d0d49ac2772df463709e844ed4c129c317a3d7d85
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://muguet.fr/sites/default/files/file/51426816177.pdf In PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/mimis.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/xotorodixozopu.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/1912618761.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/4d7a839bf3c39e77cf8dd05a8e734af0/68213138087.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/84475166272.pdfIn PDF document text
    • https://timminsrenovations.ca/file/swD3FD5Zj8iWx1bh.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/69313930531.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ef1846561---26217681192.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/96432364074.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/pitemimadelelav.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/miwonidopubuxamixomibisi.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/e8074b31ecbed75fc4783cd3658c698d/59448221842.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/lefuwirejexojiwozopujozes.pdfIn PDF document text
    • https://ilonew.tasksplan.com/userfiles/files/vatukivopeki.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/69845928959.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/85140702955.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/64916052584.pdfIn PDF document text
    • https://aaaxxion.info/images/file/18863484282.pdfIn PDF document text
    • http://abpaluso.com/upload/file/bofisomelotumorimaxo.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/bajanexobimowewuki.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba37879712---sobil.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/202193353466678.pdfIn PDF document text
    • https://baptistfriends.org/media/45573099981.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/bomuvaloguzagir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+bypass+lock+screenPDF 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_off0000cb05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB05 16052 bytes
SHA-256: 7d0d9e76825c8f517ef7bdf6bbe5dc3175d7a1e7d511c85f40d3f9c57dbfdf91
font_01_sfnt_off0000f456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF456 10696 bytes
SHA-256: f1aec6901d85968c3bc087d9712375b512eddef2c467b53e9833753790d21b58
font_02_sfnt_off00010cea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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