Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfd71446cd4f3f85…

MALICIOUS

PDF

80.3 KB Created: 2021-09-17 17:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3a9ca0e8e2eb018aa891707742c67b1b SHA-1: 64f0439856d46799a9396abe69fef924502b1a62 SHA-256: dfd71446cd4f3f85f1af3b2265aea4c0d0154622029732ccac3b7ce455746de9
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, forming a link farm. These links likely serve to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161411d03a902e---segerovoguvuve.pdf In PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614161c83886c---melilabezezizanalut.pdfIn PDF document text
    • https://0955205219.jwa.tw/userfiles/files/kasapeganiwidu.pdfIn PDF document text
    • https://technoarc.net/userfiles/file/85920487532.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/bejamar.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/75323852978.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/walaworu.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/35149201259.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/1098225476.pdfIn PDF document text
    • https://denimder.org/resimler/files/komurujuzedijigoril.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/furudomudigef.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383ffa8cb58---24117489746.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/16340126715.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/78060074667.pdfIn PDF document text
    • https://banghenails.com/upload/file/7953781150.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/biduse.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/79037713825.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8071930d5---29132795071.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/mipap.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/kunaxesitakufobe.pdfIn PDF document text
    • http://emeat.ru/var/files/58242814428.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/81238945929.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/62216701677.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/a1fa444dea24d46dcce59c1db66234d1/tolixosinedevawa.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/zamoviridomiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=earnkaro+apk+downloadPDF 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_off0000d69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69C 10056 bytes
SHA-256: 94ba40a714d93a4f4c84101482afd91e3d9031f578237a33705b1d69b6b389c7
font_01_sfnt_off0000ed0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0D 18056 bytes
SHA-256: 38450adb1df9b83c36ecbb47157a71fe49c49b26145f3ad0658fd27bd3497c0c
font_02_sfnt_off00011b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1