Malicious PDF — malware analysis report

Static analysis result for SHA-256 13a5f06c41766f97…

MALICIOUS

PDF

69.3 KB Created: 2021-09-26 13:31:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 99dcd528459e0a3503831cb0d24d8bfd SHA-1: 0affbc9b29f8e1d19210d4f9363ae184ef3bea5d SHA-256: 13a5f06c41766f972b4a9099ee324d505d4a4bd26019611462b86b9def438f44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to compromised WordPress uploads and other disposable hosting sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • 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
  • 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://nomylo.ru/uplcv?utm_term=stream+video+from+pc+to+android+vlc PDF link annotation
    • http://goldendazzle.com/upload/quangtri/files/falijos.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/78235761608.pdfIn PDF document text
    • http://polipack.ru/content/file/zexokusuname.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/4544299110.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1696a17b2---lafumopajibebarujaxifi.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/21424242703.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109231702211568.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/e75c77d5e3ce263db44d5afb78974668/10820900619.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/61335059962.pdfIn PDF document text
    • http://polipack.ru/content/file/wubakizezixexole.pdfIn PDF document text
    • https://keongracun.org/contents/files/59764004590.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/63180148675.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/1fd3dc70ae1cd72f593f105755be6ac6/volejeweximisume.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/93844a7b7c7f4a4bcf9aaf6c8c9521db/fegekabes.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/34240028931.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/tojelik.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d8fd9d9961---62270059060.pdfIn PDF document text
    • http://yourhandmadeitems.com/userfiles/file/xaduzejisupopivafaduluxu.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/79253713829.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb0059b3ab---16983644105.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd7d62f473---30931297750.pdfIn PDF document text
    • http://hoigolfbinhthuan.com/users/files/xipobotuzibazababi.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614029a5b6fc5---60141146865.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/34478059306.pdfIn PDF document text
    • 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_off0000afe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F2 14760 bytes
SHA-256: 775b44e276008e1acdfba56d5e846fbf6423a30dbb91cd36b96851f6bebf5493
font_02_sfnt_off0000ed3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3D 10752 bytes
SHA-256: e0c096788c7c0abd5d98543ec2ceabcd79f5d35ce3168a34bdaa9e2f35177fd4

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