Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd38b35901d9af1e…

MALICIOUS

PDF

82.3 KB Created: 2021-09-06 11:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cfa5e2fed8c2ffbd6afbb754bc6d8f62 SHA-1: 15bb36cab38795df986294cefc910234ff8fc57c SHA-256: dd38b35901d9af1ee50a3f6e9744e3dc84ba5ffee13fbb2936dce26e5503d3e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://medvor.ru/uplcv?utm_term=veda+hutbesi+pdf PDF link annotation
    • http://tiszaikaland.hu/upload/file/sabalerujowuve.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/33687279322.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/89607929350.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/35356306647.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/okg1f8mj2pqlh236qd53han1gv/52346465484.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/dilako.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/paremuvegi.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/8670b4ff69ec8e5ac3c660a8294160e9/godujo.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adbc13d86f1---deziz.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/doferupiwowemelanu.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/ed4345989ad9fbf692b9308f83974b0b/kedim.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1612635a19caeb---fosutel.pdfIn PDF document text
    • http://orem.mn/uploads/files/wanewuvedopiroxolu.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/benesujubad.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/97827993099.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/feluf.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210606_194647.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/dogapa.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fa87b15a4---29322181648.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/99407210569.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/97393645842.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/kmea5bmeiq5nbl93sllm8foa3o/rikemukumakofokebijabu.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/79384125141.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/ruxerejila.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_off0000da9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9E 20728 bytes
SHA-256: 67e4e0c59a8f499d05d68f41538a11455ecf4e0306ee9b3627545a44fb45a756
font_01_sfnt_off00010af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF8 10436 bytes
SHA-256: 73832c44f4136bc6a13efdafc2cda547ac2a02dbb9d08952d13cb05e82cc22b9
font_02_sfnt_off0001228c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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