Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d425c310f8cd494…

MALICIOUS

PDF

70.5 KB Created: 2021-10-02 20:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 01ada38e232212e7e8a4697e6caedaa3 SHA-1: fba55000998355582502b37b89fa3fd10268a761 SHA-256: 2d425c310f8cd494910ec2be5e18e63ffac339a936e48fc3b23bfe019b71bef0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of embedded URLs and the overall structure suggest it's designed to lead users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=the+hensel+twins+today PDF link annotation
    • https://pvesc.vn/uploaded/file/fusebazisipujerumit.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614d43bf2804e---63080412739.pdfIn PDF document text
    • http://markaz-e-durood.com/EditorImages/file/12776918616.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/nidozuzojonarowafuvuvad.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/22295961527.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/13920392877.pdfIn PDF document text
    • http://posnlks.com/UserFiles/File/powabipexomefomubokuxuj.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/siduxanejusalavulux.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/21139329760.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/mitogoz.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156e0de992b8---24502352305.pdfIn PDF document text
    • http://ateliergermain.org/sites/default/files/file/xofajelitowedaka.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/a80d9ce86aebde63eb5aa962a104c915/9995716704.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/lumukexuzivesi.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/vujiwuvixagenuvodazixuru.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/lurobose.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/43895192667.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/zatit.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/17691176417.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/71071827889.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/75048040110.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/metafovop.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/revadekapitezobonugozamuj.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/xijekinevaw.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/tofutisigo.pdfIn PDF document text
    • https://unitjaya.com/contents/files/44793923869.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_off0000b534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB534 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD46 15316 bytes
SHA-256: fc48ab4a5131bf51d6c693a16ff0ab81204073908ddff2d2a03f802a85d6df96
font_02_sfnt_off0000f346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF346 10408 bytes
SHA-256: eb6e91edf29352d5c54cbebacb8f948227a0f969b8a63ff7b0e7f3c311cc7b12

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