Malicious PDF — malware analysis report

Static analysis result for SHA-256 00142fcfdf6a7a08…

MALICIOUS

PDF

69.2 KB Created: 2021-09-11 22:17:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ba5ef436459b424c29c0dce17ed5c3e0 SHA-1: 08cfe8c56770b6ee48514560bdb92999f90f1b5b SHA-256: 00142fcfdf6a7a08fb4b6be185bcb83b569fd799c4f7f2c470905f2367fc0300
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm for SEO manipulation or to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation of PDF vulnerabilities to redirect users or download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://isleo.com/i_photos/file/13426641710.pdf In PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ami6qq1sc74op8qgkvggsdr973/7553917416.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/22722395882.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/dbdccd1fc6fe7503a868b05745685057/28124851597.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/75130439260.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/fl8ep6herfd62bl8egqc13rpvc/pipililidefomevixol.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136d63a6e8eb---29316779607.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16136dae03f90e---21326609414.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/35307478999.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/mikulozozowijuz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137733266591---lixajosekamawi.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/53524121225.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/metizegedulovuxovalokedez.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/44910171509.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/vupedexebuf.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/vokazegat.pdfIn PDF document text
    • http://domplus.su/userfiles/files/rutikofunebidole.pdfIn PDF document text
    • http://hopkim.vn/upload/files/rogufotoxemorebitisebused.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7b4f16442---moxerobiwomiruluxego.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/wiwekile.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/83340196228.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/kiginadodum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=league+of+stickman+free+apkPDF 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_off0000af40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC757 10928 bytes
SHA-256: abe7ab93ab312e4b5e140350d78b6387de9da3515faf88397bcf2d2d7078d207
font_02_sfnt_off0000e0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A8 15288 bytes
SHA-256: 528089fc0b99e8ce8011092e262e94dc4a4debc90e899116e4fb48e6b0f8b36c

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