Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca676555dae85b19…

MALICIOUS

PDF

72.1 KB Created: 2021-09-01 20:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3fbea125482d26f0ab537a713cd2eb96 SHA-1: 18d85a0778b7497e51777baaaf9aae1961183b93 SHA-256: ca676555dae85b19a2979da84bb12cfd3ed4b650da7a7e9781a2217b62cf99b3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload directories and other domains, suggesting an attempt to distribute malicious content or conduct phishing. The PDF structure itself does not contain readable content, but the heuristics indicate a clear intent to redirect users through a series of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://nacyc.jp/Upload/file/88874106895.pdf In PDF document text
    • http://osteriadelcampanile.com/userfiles/files/kodetigab.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160afc44f6a1b1---gaxulolivovuwefumetagi.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3922394862---75636613035.pdfIn PDF document text
    • http://vswet.ru/f/vevaditusowodesafuridexel.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611027fa0cf5d---5269366799.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612faafb1e861---kegeziwofexedokuxonet.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/70019763715.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a0a819e7ed---56134284111.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/871d1a28a6078ced7070272a99d623f2/fuzis.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/bajigaxejefaver.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/319dfecf60112d82f8e8b2205d18d21a/mokakevagekexinareja.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715ddba2188---keferudupodusemuzeluw.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16079553d7f1bc---sokajuka.pdfIn PDF document text
    • http://stromzeleny.cz/file/zefekaxivatizowu.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81611925074.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/39808519362.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/kipisogavan.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/bofonepupuvogokaxatas.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607924c03f94c---genutaripibobar.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/xozutemivosomisekojel.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/99522052566.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=campbelltown+bicycle+education+centrePDF 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_off0000b7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7CD 10976 bytes
SHA-256: 90b7746f8b3dc4da0cbb9902ed28295390e89231713c613c12e39ce9728927e6
font_01_sfnt_off0000d110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD110 16156 bytes
SHA-256: fc1c564d77475c65e8b0fd97a975b86819b95f11863b35449885ff70cd628056
font_02_sfnt_off0000fa7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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