Malicious PDF — malware analysis report

Static analysis result for SHA-256 29471c2f9c6e5b37…

MALICIOUS

PDF

76.9 KB Created: 2021-09-11 22:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2b1788c6a23d9d09c75ab9dd0db56b13 SHA-1: d86ab9100bf1d1b181fc7bdc4bc1c9d9520ebba3 SHA-256: 29471c2f9c6e5b3721d6e1ce494d2e55db06813237b8d97b302f9030942d0dd3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, despite some being marked benign, contribute to the overall pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/40484290016.pdf In PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/dizodokote.pdfIn PDF document text
    • https://roarmysecurity.ro/mm/file/galutizopufidegefumuluku.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/newalofogisujomuve.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/27349410120.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/rapopikudegojelose.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/84577977403.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/40454304503.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/dasataburakiboxixiz.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/49120954771.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/gewevi.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/pokijetujibaso.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/37556745901.pdfIn PDF document text
    • http://gr-chem.com/upload/files/65871503527.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/66258137967.pdfIn PDF document text
    • http://newmob.it/userfiles/files/89138783119.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/95924594095.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/h5sofp4gi0atud4bkc2q698l8g/fuxasoboriwazuj.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321b1392f49---magizifuzokirewod.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/wavoxamekikomutax.pdfIn PDF document text
    • https://o-dance.com/upload/files/tawipetipeniritegelajaw.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/61843896352.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/wuzizenajar.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/xegenuvojom.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/92039291791.pdfIn PDF document text
    • https://2acontractor.it/images/file/lorinugapik.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b0f1564af---17348433309.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=diablo+2+android+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_off0000c7bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BC 10340 bytes
SHA-256: 7f4e49e088b92917139254d3e7b0e15667b9daba4e495055773a37ec909f918d
font_01_sfnt_off0000dee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE2 17724 bytes
SHA-256: 0933c2720b122d50027fa8fd08971acac40041726d029aafeb7c7a4ccdacbb34
font_02_sfnt_off00010c6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1