Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e9bba4a0b7e8fb…

MALICIOUS

PDF

78.1 KB Created: 2021-09-23 10:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 20e4aee4ff1dcbdd417d2e2666354335 SHA-1: d895b8396d902aac6de3c698e11081411f5fc63a SHA-256: a4e9bba4a0b7e8fb2374ba51a313d559622000142c6c2014a00a1a04fa4b5710
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • 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://coretry.ru/uplcv?utm_term=how+to+check+running+process+in+android PDF link annotation
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/e64565d8a1c8958ac27b25d7578ca297/maxafaruvekukekejox.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/guwosu.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/79328694202.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/84090147642.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/29592760668.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/vomazijilafifevezatogud.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/pozosusaf.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/66805567139.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/vinusatixe.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/potapegaparudisavagip.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/wenivezegevowusu.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/40246484119.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613984918247a---34365504524.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/68538995473.pdfIn PDF document text
    • https://korankertas.com/contents/files/dopukujagimamejesidori.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/84590415269.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/b188d36dadf5b1031709d3729c274cfc/wuladajo.pdfIn PDF document text
    • https://discovery99.com/userfiles/file/92618881101.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/fusoxamijonezukipixajedu.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/gepufikolubo.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/lakiramasamalopixevabovuf.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/xipuvabolimafofekude.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_off0000ca72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA72 11016 bytes
SHA-256: 92ff9675d74dd1e06540f0131d08c983130bbe152a3851b121474f05cadbd7f1
font_01_sfnt_off0000e3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D7 17836 bytes
SHA-256: cd73ff878d9d42a1d1134b1a2b37cc91f275f91e6d01f3a7cd4f06bd1725cd8d
font_02_sfnt_off0001127f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.