Malicious PDF — malware analysis report

Static analysis result for SHA-256 b50c39cbe6fe2a60…

MALICIOUS

PDF

89.9 KB Created: 2021-09-17 20:20:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 8be38cbd1cd9722649ad3d39612a4eab SHA-1: 2d06f721a6e8f65b3b2738f94fa981cb9085a269 SHA-256: b50c39cbe6fe2a60521012930b2422df1fda07f2714672ecb4b97665efd8ac86
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, some of which point to compromised WordPress upload storage. The heuristic 'SE_CALLBACK_LURE' indicates the document body is designed to trick the user into calling a phone number, a common tactic in phishing and tech-support scams. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 8

  • 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.
  • 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 http://sumisaedu.com/FileData/ckfinder/files/20210917_D94A006D3E2B365C.pdf In PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/wifowuliwexumopo.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/vagororinetobotuzigadevet.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/67488125651.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/35470071904.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/jomelulajijolijorakakis.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/jugubemodidodip.pdfIn PDF document text
    • https://mytopics.it/uploads/file/70539876777.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/21940337200.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/kiguxosemena.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/71604029235.pdfIn PDF document text
    • http://web5gstore.com/Files/files/fapevufisonurejufebuja.pdfIn PDF document text
    • https://rintrans.com/files/98986750342.pdfIn PDF document text
    • http://orderkai.com/uploads/files/71927375518.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/89269829586.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/43191076449.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/11sgkoc3v3en6df2p7ltvodu67/lukixavijede.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413973f1d83---14943846752.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/64001006654.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/rijizifikabonoz.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/74412100683.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/48070147084.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/muxadometaxane.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138d15bb2c13---96765565446.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=volley+android+studio+tutorialPDF 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_off0000f9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E2 18092 bytes
SHA-256: 61c072d731702c59280063800f09b2c73e731ac0b88afcccf03eb81c268ad76a
font_01_sfnt_off000129ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000141e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141E5 10424 bytes
SHA-256: 9a8d0d7c278fd681f9aa72e6e49d28e902d8b02b9207fe09a9af8db969a2720d

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