Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceb705e549511d5f…

MALICIOUS

PDF

96.0 KB Created: 2021-09-15 13:11:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c7e8282d6411d06b1109340c520fd607 SHA-1: c7de289f7ffdfc8a903aced432ac273f3d66d2d0 SHA-256: ceb705e549511d5f84f67ae47d3a34dd38474270e1d096137c171952664c14ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://muntepa.com/userfiles/files/5440994330.pdf In PDF document text
    • http://vom-ragnaroek.de/uploads/file/62311007876.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/foposedo.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16132aabca70b7---borulejopekowipejexeti.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/94093564356.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/katutogitesozo.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/zaguxe.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210912_193145.pdfIn PDF document text
    • http://naso10.com/userData/board/file/bivapogelawivawekofakor.pdfIn PDF document text
    • http://momsystem.ru/public/file/44566201457.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/ridupiguzixavago.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139267585ac2---23984792744.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/vafilitabago.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/7f366eefb4246c54a259ffe9f3ff7258/99241606596.pdfIn PDF document text
    • https://mmtours.si/uploads/4105956053.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/tabab.pdfIn PDF document text
    • https://dd-inside.de/userfile/file/suxidirolapevataxodinozip.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/rasikos.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3d4612dd6---86326660875.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/57581848292.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/monopetur.pdfIn PDF document text
    • http://synfarm.com/upload/files/vurej.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/58145100233.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/97754493575.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/0e6f850be4cb0e281844b6917cd4ee76/gufeke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=what+to+write+in+subject+line+while+sending+resumePDF 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_off000110a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A5 18476 bytes
SHA-256: bc3125432f6d9249ecb7e93174e3cef7d31220d7a3720d2413682facc34fcf57
font_01_sfnt_off0001400a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1400A 11264 bytes
SHA-256: f977aeaca44857212d8e5138bbde4d7915e13ef878e25b10fc8d0ca568de8d3f
font_02_sfnt_off00015a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1