Malicious PDF — malware analysis report

Static analysis result for SHA-256 52496c144145f2b2…

MALICIOUS

PDF

69.8 KB Created: 2021-09-27 01:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 28fa2ebd007e423ed88fb9caa3528e3a SHA-1: 2d0ae7b4f5d8e0d0ca6944e35a1936067f726313 SHA-256: 52496c144145f2b20638011af8196bf70f4589231523ad595428a8b6c60c5c48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://drafthe.ru/uplcv?utm_term=free+online+tv+movies PDF link annotation
    • http://maychaybocaocap.com/app/webroot/uploads/files/11618812276.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/xipaxagutot.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/kuboge.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109172303567892.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/84041052830.pdfIn PDF document text
    • http://unionasset.net/file_upload/spaw_upload/file/20210906024616.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161327d15f3943---79973154849.pdfIn PDF document text
    • http://bibikid.ru/upload/dudebidafa.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/fomabelodagatatewuxuta.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/64297282274.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/11493289431.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613723af700e3---xexini.pdfIn PDF document text
    • http://metallpress.ru/files/fedegogoledaredaputoka.pdfIn PDF document text
    • http://104408017.linker.tw/files/79438033626.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/xafekijovebukig.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/tadilejumivopusifejozabaw.pdfIn PDF document text
    • https://vpmemorial.net/images/file/taseposafutanij.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/70660229660.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rafomuwazutedanezavalera.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16130c8e5c8237---parokuwigekuwok.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/lelikemilosutezesodina.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/bozeduzegojubab.pdfIn PDF document text
    • http://kotolantopeni.cz/file/jixanexegasiku.pdfIn PDF document text
    • https://harteron.ee/userfiles/file/48719104251.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_off0000b373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB373 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8A 10148 bytes
SHA-256: b68713d53aec97c735d9886d23b0c9c7ca10e1781115df13f6461682ce40e14a
font_02_sfnt_off0000e22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22C 15400 bytes
SHA-256: 2ba32a56c4e95b16a55a41e1ffb1e1776ab1d062bcfd15b39df497d6dd674ab5