Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ea8f2a484bf060f…

MALICIOUS

PDF

72.9 KB Created: 2021-10-01 15:23:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8118c382fd803f436c62fa81afb110d7 SHA-1: 4363970cd030dab3cab08889a6e34d516d43c132 SHA-256: 8ea8f2a484bf060fd1c46a95476cb5a6d2525e60a2bc6523bd04f149ad78a82e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document may also attempt to trick users into calling a fraudulent support number, a common tactic in phishing and tech-support scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

Heuristics 7

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=psp+mobile+game+download PDF link annotation
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/e28877f234cf64d0c8e67071a32116b0/83867868172.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/5c34b13adaee9dfac681afb08a85ad28/puduxikifuvu.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/zozirumidaduxixabuvor.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/5306940318.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/26816739015.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/c719f4ce669feca2d2249b9610467482/penatojunaforosuv.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141fa7bc7450---59241479230.pdfIn PDF document text
    • https://e-midas.ro/files/file/powelefikigumudebokim.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/pipejiwepexeviku.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/10556329254.pdfIn PDF document text
    • https://matagujrischool.com/admin/imagetemp1/file/texudubemimurujolenebake.pdfIn PDF document text
    • http://sjanzee.nl/file/90339874560.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/79952664095.pdfIn PDF document text
    • https://rugsdirect4u.com/uploadedfiles/file/birudarawiveduluvamuzel.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/ae184fa43ecb750035c67713b41bc46e/geripinosovapigos.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/lafiwed.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/161475e2b42846---zisojen.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/furazodut.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/xemadelamazip.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/21306021338.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/kamalaretoge.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/6482450596.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/20ea9710064ce626525a719f85a09892/72279925533.pdfIn PDF document text
    • http://hanifeugur.com/image/files/84490676892.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/lifasunawefunojesilawi.pdfIn PDF document text
    • http://idcla.net/upload/files/jajilega.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_off0000b9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9DE 16504 bytes
SHA-256: 397979eb82db7fbf072b2b77457611cd611098a4986ed80be0c7045f9e07c659
font_01_sfnt_off0000e3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFE 10764 bytes
SHA-256: efc3bbec5e5ab50bbf83d8f47007f7dd94917b48beb61ee0e7e64fa4f3bc4dda

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