Malicious PDF — malware analysis report

Static analysis result for SHA-256 620be9ee00a6551a…

MALICIOUS

PDF

84.1 KB Created: 2021-09-04 11:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 28596d48a6a1779b972afe5d6300c4c8 SHA-1: b7a0a49d19ab8a2559f2aba3144381c1e1151215 SHA-256: 620be9ee00a6551acb68001e1b2e4e13a324303915d0780f652c2ace49433ba1
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload storage, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://kimyasaldubeller.com/upload/ckfinder/files/mozikozurunefula.pdf In PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/e04q5f6596fln835uahkai0soo/80328816.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/2lpr4d81fsoonqgrjkf9jpmr2b/dibisizu.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/kozawibofolunugowu.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/fb776476386a00886aa9b03935df49f6/42986240398.pdfIn PDF document text
    • http://519pf.com/userfiles/files/merivupuxoxumetu.pdfIn PDF document text
    • http://laduses.nl/image/file/tijumikifizodug.pdfIn PDF document text
    • http://dyccpharma.com/upload/files/30522287578.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/ee61ceb62265e2ddaa42d429d6d51676/wexawamuxiniromuvo.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/33137868333.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/55939270486.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/44f14d1d3b337f2c2411d4fb5d5c3e1a/6799503943.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071e3927efc5---xetusug.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/kubomogajulapibixoronilem.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/94588650393.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc384a8718---49521524716.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/nugigixomegipoweto.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcfab05fce---sigitekarojiwubeg.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ltnhc1p9o030uudmh8sbv985d2/bodorosoxipeterorebizefa.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a173247e3---65235097543.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/c8d79ca7eac2648e4e8a62bee263b98b/pugelavalowojonafefa.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/wunenesamezunaleliletiweg.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/raruwokilafaven.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=free+software+to+convert+excel+to+pdf+formatPDF 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_off0000e3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C8 10920 bytes
SHA-256: 285e326ab9ceeb7dbac6033ac7e5730fcc14338057cf4cb4ceead200aabca446
font_01_sfnt_off0000fd33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11545 17476 bytes
SHA-256: 1f18fcd7cc8c5db38814b0bef6f796ef545f1530facc9cc1698f25362b148449