Malicious PDF — malware analysis report

Static analysis result for SHA-256 50dcb587665c6fad…

MALICIOUS

PDF

85.1 KB Created: 2021-09-13 02:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8a2b31629ef7d922d624da008a7fec03 SHA-1: aabd4e5bc4ad3bb734838a7d70c6aab44d965d25 SHA-256: 50dcb587665c6fad09ec9a6693edd4225437a95daa48d32127918b7bc67a5275
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload storage, suggesting a link farm designed to obscure the ultimate destination. The presence of a 'callback phishing phone lure' heuristic indicates an attempt to trick users into calling a fraudulent number. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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 http://gdlianyu.com/uploadfiles/file/pawosivuge.pdf In PDF document text
    • http://thankschicken.com/uploads/files/lijajadisavineru.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/suxajewin.pdfIn PDF document text
    • http://theponghop.com/upload/files/43598299733.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/wuwujugozi.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210910171922_l10496.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/19227311581.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/54374398354.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395a59cda31---57842936748.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/93416294311.pdfIn PDF document text
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/70865774987.pdfIn PDF document text
    • http://luatkhangthai.vn/upload/fck/file/302282758.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/88564903091.pdfIn PDF document text
    • http://space-edge.com/upload/files/dupawusu.pdfIn PDF document text
    • http://puisan.ru/uploads/file/pujunamoduwipegumapewaw.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/161332e83cea8e---rokamefoxez.pdfIn PDF document text
    • https://castel.ro/userfiles/file/89770621091.pdfIn PDF document text
    • http://cosyromania.com/media/file/48259139278.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132f50f15a1f---20034368999.pdfIn PDF document text
    • http://yejiya.com/userfiles/file/38407318761.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/70206357396.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/wafiwiwomoregomot.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/39879419777.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/nufuvegotofikawokagag.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210912001857.pdfIn macro / runtime command snippet
    • http://abwmarlboropike.com/uploads/files/95042455585.pdfIn macro / runtime command snippet
    • https://carrieres-pierre.com/userfiles/file/tefevafuwi.pdfIn PDF document text
    • http://gancza.pl/userfiIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=transfert+de+photos+android+vers+macPDF 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_off0000ddd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E5 22140 bytes
SHA-256: 3854c872b4f380c55934a353eda0faf05ffd7459798d52b06602c00cd7c692b7
font_02_sfnt_off00012d42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D42 10868 bytes
SHA-256: ad1042a7df7ea45da968f39de9590c334abe97d6c0488e827db4fb540d454359

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