Malicious PDF — malware analysis report

Static analysis result for SHA-256 b483474e6a7ab244…

MALICIOUS

PDF

84.7 KB Created: 2021-08-14 10:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6ada3b5db79afa7175b442d2d884eec8 SHA-1: 81b200a33a3de2d2949c483ac09a9597ba12eb00 SHA-256: b483474e6a7ab244594c44ef3ca4791dce6edabfb6aafb0b8d2df2bef961483f
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript and multiple external links, some of which point to compromised WordPress sites. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick users into calling a phone number, a common tactic in tech-support scams and callback phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to facilitate further social engineering or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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.
  • 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://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/7f1c1407f24780ca819aa2968a7c7601/33867738024.pdf In PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/1bb93507489920dec7029a85d868b474/rulogos.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/kujunatidi.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c7903395669---bogubopunumawowonolefo.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/vaxadutivajugim.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c180f0d3da5---7908025600.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/fd02f2fd0615c388917f66170373cace/nilikupawe.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/fuvulivudim.pdfIn PDF document text
    • https://www.micd.edu.np/ckfinder/userfiles/files/65942100734.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/21059154972.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/2f2e7fcd5ac9f3ba991e6a211c4daee9/xabitisasejodipe.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/81534334170.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/17089643263.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a461d0d7d74---99998786754.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/64941990751.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/zugojagej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=google+account+backup+android+phonePDF 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_off0000e7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EC 17120 bytes
SHA-256: 87d067b1367b9736681a226b23e03197dbee2ad03e4ef2da0ef2368a63b801ca
font_01_sfnt_off000114b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCA 10996 bytes
SHA-256: 12f256232acadd8c1eeb9198b7c2a79c4f408d3d0497fdde6178bba5e4634344

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