Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4dde59d23f371b3…

MALICIOUS

PDF

89.3 KB Created: 2021-09-16 15:25:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 226a967f42753af0c539fd0e80f4f602 SHA-1: d62225bea820b2f78ffa8779bc020fee59a31311 SHA-256: e4dde59d23f371b373f2ed9c4f0ca0efcfaa2cab3492347a05ef31afe2105d13
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised 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 delivery through these links. The presence of 'utm_term' in one URL suggests tracking, common in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://irlanc.ru/uplcv?utm_term=tokisaki+kurumi+4k+hd+wallpaper PDF link annotation
    • https://hkki.org/userfiles/files/sajijosimoduzagikiloma.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/gazonitot.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/makisurumimiji.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/zolujizot.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/goxuvifezomo.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/q41npd097qtf6d1iik3t71q6e2/65736171596.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/mudekekazekoxeka.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d78f2db84---35738331535.pdfIn PDF document text
    • http://healthywithhart.com/res/file/24114236957.pdfIn PDF document text
    • https://kimansion.com/uploads/file/72767565126.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/52932619660.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/66621202515.pdfIn PDF document text
    • http://jawarakreasi.com/file/ravonomosaluxijafe.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/kesuvuvidajoni.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/59128251304.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/wonedekiza.pdfIn PDF document text
    • https://12waktu.com/contents/files/11256718613.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/ade8c807b9175f9af48d9a1daf65de4f/jilenedujerefaraforewiz.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/82611786146.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/dejorosajifedas.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa5461df0a---20346164246.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/sinavebusez.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/ziminuvitikalili.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/49293976026.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/teravivinugejirima.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_off0000f7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF1 17884 bytes
SHA-256: 412a5255c9eb4b70087a6a7984d0fc020a62b323870642d51ddaa82c8da7afd4
font_02_sfnt_off00013e90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E90 10776 bytes
SHA-256: 57a61c54aad07b739ce2c9a896f2557d7e6f23026d9bfbd2f9133ee6b02438c2

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