Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0bb6f0600db74e3…

MALICIOUS

PDF

84.3 KB Created: 2021-09-17 10:54:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 59a724266c6eb958d4e4583ed4aeb6a8 SHA-1: 2050d2fd15b7fc4a29b7d6a9c0af8d2588e16a27 SHA-256: d0bb6f0600db74e323cefcfbc6dbe52b99205f44ca42ade33c059562a0593368
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The embedded JavaScript stream likely facilitates the redirection or further malicious activity, contributing to a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=social+paranoia+disorder PDF link annotation
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ce902c9d8---tufuravepojig.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/11137985996.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/75484608223.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23234560872.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109061850522745.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0951445f5---pinekarex.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/36721344280.pdfIn PDF document text
    • https://congchung7.com/upload/file/84047036299.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c6dd2d1c158c127fc158fd72a39fae08/jabatinuzijuvazok.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/subasawonopilafag.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/40021822081.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/dirujowofidimi.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/71682319155.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/baturag.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/1372133498612f4dfec9269.pdfIn PDF document text
    • https://svltv.in/userfiles/files/fewulode.pdfIn PDF document text
    • http://dgjst.com/upfile/file/14217621297.pdfIn PDF document text
    • https://iword.de/userfiles/file/bozejuwegini.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/nexuvijiworem.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/35879111791.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/52813399494.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/pijomebitanebekud.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131491365e51---mubakunubifamasak.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_off0000e6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FF 17288 bytes
SHA-256: 6314e94b0037562c8b3d359b6680f3a4d0340aa5b91c34be20320f7468633c35
font_01_sfnt_off0001142b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142B 10484 bytes
SHA-256: 2fa7813de46f0e7e075d03d72bdd7dcce3aecbec90ae683050ef6cb6ccad2da0
font_02_sfnt_off00012c04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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