Malicious PDF — malware analysis report

Static analysis result for SHA-256 2905207083893cbb…

MALICIOUS

PDF

81.1 KB Created: 2021-09-07 05:19:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 79c0944ab9a2c1e50a9b2ee46d1dab05 SHA-1: 058264dfd810bf288181c832d9f2c07ef3f4296a SHA-256: 2905207083893cbb8adc78444a851a5136d02a51b759ce79b2532f9a7ff96412
204 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document likely prompts the user to install a fake browser update or plugin. The numerous embedded URLs, many pointing to disposable hosting or compromised CMS uploads, suggest a link farm designed to redirect users to malicious sites. While no scripts were directly extracted, the PDF format and embedded URLs are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://huntic.ru/uplcv?utm_term=pdf+resize+less+than+100kb+software PDF link annotation
    • http://sjar-tech.com/uploadfile/file///2021051604563773.pdfIn PDF document text
    • http://goergenpainting.com/clients/0/0d/0d1038892961fdbf96b6a8e7e8daca8f/File/35393326643.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/vized.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/ufpktqgo40f1p0hp6ml8m7igk7/10589612213.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/gupibupexirumebirizebu.pdfIn PDF document text
    • http://envigest.cz/upload/file/mewufefonibaralezovelaz.pdfIn PDF document text
    • http://446888.top/userfiles/file/rijojizutebefanasagu.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/fekazovidapolagarigovax.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/22838914146.pdfIn PDF document text
    • http://1careglobal.com/upload/files/19634510235.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/9151226367.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/4287d970e28ba9bb9a8e2f6cea2ce603/4485750665.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/23732619660.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/fazetezutarujujowiven.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3303e2f0eb---towigiwib.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/fibalogi.pdfIn PDF document text
    • http://yuanda-boiler.com/d/files/buxux.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/mevizepiwufujomavagovo.pdfIn PDF document text
    • https://farmstead.tw/farmstead/upload/files/zesagojifudivewa.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160916e38f1558---97067111062.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/48669663602.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/93706895150.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_off0000d5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B4 11004 bytes
SHA-256: 40073b066b7ead161af571c17cb71d5b8a161f084740638736edf88ad936cd59
font_01_sfnt_off0000ef51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10763 18732 bytes
SHA-256: efdc9060776e1fd77af45165eb121c41ab04baec4e8da36088331e6318c03041

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