Malicious PDF — malware analysis report

Static analysis result for SHA-256 e915219eb6ef7908…

MALICIOUS

PDF

80.3 KB Created: 2021-09-02 19:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 90a2d4eb4744fe442e9d0ccc971bcbf5 SHA-1: b3f74da113d7c09298921874bdc7d6c1cce6cd6a SHA-256: e915219eb6ef7908387d6abd661719008befefdd212390a7f3d294a2be81805b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to obscure the true destination. ClamAV and ML classifiers identified this PDF as malicious, specifically a phishing trojan. The embedded URLs suggest an attempt to lure users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://moulindelarroque.com/userfiles/file/72982817882.pdf In PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b1db18632---bivetinixobop.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/adeab22c6e7b52a9e57fc4e57df5ceb5/motukopepasivemos.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/55215718446.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/sazavunuvajokoxafekuxe.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c28b3008ca1---wolisutumebemuwolu.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/kasexa.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/nuwesiroranevegane.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/23430898263.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16075bbfdb5fb4---gozubibireg.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4b0b314dacf15c8a5097f409a1377b09/tatirazadanojosakuma.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/j1cuscoucij281b53praqo7ov5/woluzaxozider.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/wamekadi.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/sasowonif.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/gadog.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/57195384888.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210703_F989743D9DB31B64.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/jigadamonomuligasotu.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/44571256047.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/20562766555.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/62760170057.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/begofojikoraxekewofutotez.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/ropixomavifizituwizo.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/banobukabekewekavujupe.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/kovofevorodux.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/zoduratumavewerobima.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=facebook+coding+language+pdfPDF 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_off0000d75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF70 16928 bytes
SHA-256: 6d8f76421d77d00a78da5bc182440ce515e69776d362c0a1f37b82625aa4fc83
font_02_sfnt_off00011b5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5D 10736 bytes
SHA-256: 9b2bb8b47e240e8e65985baf5dc5b55982e9436ef8b09a6a9b52cff5168ad01c