Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ae17a41045834a6…

MALICIOUS

PDF

96.3 KB Created: 2021-06-29 12:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8bce67219f1a50c05e975aa9eedbe972 SHA-1: ee669f2380004d44feb544f17f0c2fe109a3e62a SHA-256: 7ae17a41045834a6d5ff5051a39bce7ccc5c0e38895a7ce2f689e248a1ce55fc
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically indicating a phishing or trojan threat. Heuristics identified it as a link farm utilizing compromised CMS upload storage, pointing to multiple external URLs. The presence of these links suggests an attempt to lure users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://e-kva.ru/admin/ckfinder/userfiles/files/14125530116.pdf In PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/5626138ca8d62b9e237bcbf817b190c0/fuwenimiwegu.pdfIn PDF document text
    • https://unosms.us/userfiles/file/49573559950.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/27695461073.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d897d63665e---99269729642.pdfIn PDF document text
    • http://toonesk.com/upload/10331322324.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160843ecd8c709---48908313188.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/78452889112.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/99411441721.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072d1a8e4849---83940493259.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/34d29d74afe83a96adfb61c7b52deed7/7523460266.pdfIn PDF document text
    • https://p99.tw/pro_pic/files/81473037779.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1acf907a7---lajameferekamu.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/ff77c235c3866fb8cbdde87033f76384/25544751754.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0622/d9b612aa6c73bb7ac0b2eda7f93c0531.pdfIn PDF document text
    • http://zzweien.com/d/files/35198948842.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a72efb36af---rakobedezarafalesu.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/c5bd8b7ec3a13f188a63772c9bbba0b2/80255109677.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/fce40c4ad0d11d9f2b95ec59ce76889d/jenegezejajedurovepur.pdfIn PDF document text
    • http://atek-ent.com/upload/file/66294933829.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/5bc4639a6fea48b7dd0dc55f8ff325c0/wadivosoleturakukok.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/hrkpg3ajoip1ple2k3ffjqmu0b/suturipunaruwaravidozudu.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/c0cffnb3arpr3nrff6qjdd9kf1/55761414679.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=tamil+bible+quiz+questions+and+answers+free+downloadPDF 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_off0001149a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149A 17512 bytes
SHA-256: 9cf786974f44ad894bc727ce3575ea83872d0aa97f21e1a411e06a9d34e0fbed
font_01_sfnt_off00014254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14254 11012 bytes
SHA-256: 16ab53c3e19d8bcd11481650180d65e50bb0fa7dff685a83e097ca2c6061fe6f
font_02_sfnt_off00015bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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