Malicious PDF — malware analysis report

Static analysis result for SHA-256 36e54ab4751724e0…

MALICIOUS

PDF

84.5 KB Created: 2021-09-20 15:23:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e649657ad5d0de47f472638b7e5d2673 SHA-1: 6fc33c081390eeec86422b8485013d6e7876604d SHA-256: 36e54ab4751724e063eb12f3eed7a57d5b491ad65aa92671b534d5eba2417b63
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=outlander+book+2+pdf PDF link annotation
    • https://kabelkyaobuv.sk/editor_uploads/files/32028125174.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/vuwoxojag.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/68695556996.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/43530930419.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613723fc3ad3a---pabitokot.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/mudekigilariga.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/76998238328.pdfIn PDF document text
    • http://intemhathanh.com/img_duhoc/files/jusekotumojemetedad.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/wexonosudolitab.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/62625147114.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/wepowopimezekobidasu.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614299b2e0927---26205631073.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/62524722772.pdfIn PDF document text
    • https://hosrem.org.vn/ckfinder/userfiles/files/29701826450.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/pibijivipagefububub.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/bkshijti6iuj1naveiagjbvmf0/buzovidexujo.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/vejelepidewu.pdfIn PDF document text
    • http://datacomsystems.cz/userfiles/file/70429653968.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/koferura.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/faxulosaguje.pdfIn PDF document text
    • https://thomsonindia.com/userfiles/files/bipetelogepe.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/kofudunu.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5ac8db743---236547522.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/famanaxewakitokuve.pdfIn PDF document text
    • 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_off0000e456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE456 18420 bytes
SHA-256: a1f3364e97791d156a514314d61ae66d0e544fed435fb136a5ae214d31014e71
font_01_sfnt_off000113b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC7 10708 bytes
SHA-256: 1a9aa0b5a5cdbab72db37869ae45bd4f3c97da266a9e2407f7fc1e3d830a542d