Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc4e36c79481cfe3…

MALICIOUS

PDF

91.3 KB Created: 2021-09-02 12:30:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6cf2c9e2e7132f627e17f7da27781759 SHA-1: eb191260b0de09f3234c3b12c0164cee587abe5e SHA-256: fc4e36c79481cfe37b4e842059976e7849446b80ece8ce424213c29dd68a59e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://crewmak.ru/uplcv?utm_term=honda+jazz+2005+workshop+manual PDF link annotation
    • https://ottopianos.nl/files/nenelakawukexavelixe.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/83060826939.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/59299727005.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/nolotuborotowepeg.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b056ff65914---6411759668.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16098ac8da7c85---64847931129.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/zojudofagokakafu.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/tenituv.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d092204b141---23877665426.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/fujevu.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/a1a2bf125562b1b49d0aa9b8e15a2865/35710976034.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/mezipodulotudizosutesik.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/zivagojavinidibanijowef.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a1922e1ad4c---fisuxamaturupalujomete.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c19c2ec3eea---xusokufiwudezetof.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/pebofevosu.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/wiwovobetames.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/c66fcac401794a29d6ea25f12517175f/zetovul.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c08cb5d77---44871043705.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1610a9823871f2---velugagavewawagipuz.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/bunumakaxukonofe.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210808_0F1503C7DFEA1538.pdfIn PDF document text
    • http://roxburyhs1987.com/clients/63080/File/38788017272.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/10291999825.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_off0000fc96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC96 11168 bytes
SHA-256: 6c6ad74dfa5dbfccad2bf17d4d95b691eb346da5281a031d76331c4987e41a46
font_01_sfnt_off000116a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A2 18552 bytes
SHA-256: b861459b5a8f979d490e40bf1b9fc8417d876d6c43961eb165d48924d28ada1b
font_02_sfnt_off00014747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14747 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1