Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6b035e3fb1b14ed…

MALICIOUS

PDF

80.0 KB Created: 2021-09-16 17:24:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e7eb1e8df4d06bc0c1fcc12725cb7a55 SHA-1: 07d60d800054e9ebaafb2b8cc6c87c442ae6a300 SHA-256: e6b035e3fb1b14ed8b9b36b9a3353fc955161d8d0e68d276b19d8bcc09626be8
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be part of link farms hosted on disposable or compromised domains. Heuristics indicate it's a lure for credential phishing, potentially by mimicking MFA or one-time code requests, and also includes callback phishing elements. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://oniceh.ru/uplcv?utm_term=restore+factory+settings+samsung+galaxy PDF link annotation
    • http://positiveforce.in/uploads/files/52352665787.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/kafugebavezofifi.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/83200721735.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/1040e4fd929371108c8113d61e38942b/82323142452.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135aced52cbf---95759316322.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/77942348941.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/45cdd9e9d69ff6e903cc4507680cbb7f/57356572067.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/57144784301.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613cda159c51f---23666575284.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161364e39d2004---majiden.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/wagokudopaxeregetaso.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/21111630001.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/39716374931.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/xevemazokenix.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///mumonalefepazisibo.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/63083775363.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23134733788.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/62763661848.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614093c494368---67287131495.pdfIn PDF document text
    • http://goldmustang.com/files/files/46970162597.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/guxemurebuno.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/70562420669.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/91831835841.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_off0000d48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA6 11040 bytes
SHA-256: 3b620451bc7ebdf0d274567377debebf84cbe3c88cbbfc32b5085180f12add9c
font_02_sfnt_off00010669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10669 16872 bytes
SHA-256: 7af1bae49cad7986a8b1a2fc261fca9032c9a6664afe05f555cedc3fc67934e5

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