Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9529529db3c3a84…

MALICIOUS

PDF

81.5 KB Created: 2021-09-09 23:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3863b227805679bcb83e8224447e901d SHA-1: 0206712a4901fbe2ec1d25cee378875c233a8415 SHA-256: e9529529db3c3a847fdb961daaf1bd3363f22f7693f546b29b982e53b16f281d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various PDF files hosted on potentially compromised websites, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • 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://rlmlaw.com/images/edit_images/file/popikibizisuvupuvifukiwon.pdf In PDF document text
    • http://vencedor.coop/images/admin/file/85210328.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/daxedoxukegutatug.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210906095905.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/zomasizupu.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/cccbc9110641920877bf3fec116ce097/letijadotape.pdfIn PDF document text
    • http://ty-int.com/files/files/wezenunofiwomijasisik.pdfIn PDF document text
    • http://evola.it/userfiles/files/89571800603.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161351627b3b86---zexim.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/39308329684.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e3ac4728c---28050675539.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/nutusiditogurulaguvaza.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/63196127980.pdfIn PDF document text
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/21466320867.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/78158591875.pdfIn PDF document text
    • http://swhos.com/upload/files/50755101539.pdfIn PDF document text
    • http://surestegc.org/documentos/file/8895913356.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/dudamezuxakup.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/fasukaterinadopopunarepex.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/gekupuk.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/28007635414.pdfIn PDF document text
    • https://superpart.com/files/73786038013.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613983aa95e03---46141083305.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=download+zombie+catchers+cheatPDF 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_off0000d9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B9 17544 bytes
SHA-256: 4d3fdc7b4b97bb659698f1670050c63b42a2a446d5a76cf6b98f704a5e9b4085
font_01_sfnt_off00010766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10766 10920 bytes
SHA-256: 7d2fab80ee8bd76f3805665d7e3d97cbb2bbb937cd6386f24965baf8cb659237
font_02_sfnt_off0001208f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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