Malicious PDF — malware analysis report

Static analysis result for SHA-256 495e3813809b48cf…

MALICIOUS

PDF

97.6 KB Created: 2021-07-04 23:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 733e5aa6a008befbca2f0e625b6c2498 SHA-1: 79d8762396b31e69f701746d003c98e5f0749aa7 SHA-256: 495e3813809b48cfc2325667a7865e52d32d90ff525939c7c955a8f70f918365
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/42fad0777a19d7d8835b682a75de3b46/11537690406.pdf In PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/per1lj5hj1o5a9ldse1j1n7dh7/vozugugajazezewurenidujup.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/99002212103.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/bdbfpriv6r96hi2vn1j7fpf1nb/73722915546.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/20930900955.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/50460227287.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/68761640414.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742b7c064e2---47238769977.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/o2fq6kcklb2mifvbhph0dr1bkd/75374214092.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/86778396284.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/vemozavebu.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbfe15ac26---pakozigikagoxazif.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/wazabufemag.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/dodas.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1620933115.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/mvjr6lla76gnreibe4fsj3kdd7/64280617140.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/89235645992.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b994723c0---77958178897.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/i45rrr5ic200precll4de61113/5806010815.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/28568876574.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/26154b113ee34d164a8fa187b482a8b1/2253181770.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/0219b2024a85ea4e459ca62db72d6db4/metirilojati.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/bemimukumodanagabozizu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=god+is+a+god+of+love+and+wrath+versePDF 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_off00011d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3E 16716 bytes
SHA-256: 8dcb681c3de0d9361597b000bfc2dd5fc53595d2fabeb87f61552e53c54f8609
font_01_sfnt_off00014855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14855 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001606c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1606C 10824 bytes
SHA-256: 0927d69579532450722425d26c9351889d1636f0d82d0d77dc812686eb9cf724