Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0fb434e41f978a2…

MALICIOUS

PDF

76.2 KB Created: 2021-09-05 02:15:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0079653b0abb2099c814360c64f8b566 SHA-1: 951b49498ab687e879ee330689acdf2740d59c93 SHA-256: e0fb434e41f978a2c835eb50cef0ae68f28ee3066e7582684e7194b0bee28039
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210707184442.pdf In PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/h766jbnr1mo8cmu0seflrt6tc7/57488003559.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608120fe7dcd6---jebew.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/7a297ad08a9d495a7279ff4ccadfed4d/96297494201.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210717_068C491638892473.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/bubejikafo.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/90350432332.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/12151551735.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/bujimowafezopulig.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/61683982287.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/12003077595.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/535e007f68db47b6f3da2edb81645e0e/vefaviwupexag.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160e1500a0c351---4727431143.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/rabazixazelote.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/44859690723.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/sititigamirutirelesejako.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/votajaverutafi.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/1a977e1e4bf4677e27499b7d3f884d99/furerawujusezoxof.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/89381774904.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160985bc168bd0---5629968516.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/sitebapenotaj.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fazipoluberilis.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/gibotojiwomodorosu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=mcgraw+hill+science+book+pdfPDF 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://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_off0000c701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC701 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF18 11112 bytes
SHA-256: b77f58e8281d5c62acf6be65f802334b506bcc63b699ff534f791f99fc7faeee
font_02_sfnt_off0000f891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF891 17344 bytes
SHA-256: bc6a78058d13c121ecbe404bb12dfcac2d046035b828081a78f144c72c9193c9

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