Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3e5bcd6cc5464b7…

MALICIOUS

PDF

70.8 KB Created: 2021-09-24 06:21:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bbe2872b2698744dd46c47e433f718da SHA-1: bcae56ed860f80d464c81f654b2aeba9b2798edf SHA-256: d3e5bcd6cc5464b785079c5d09eb8cf19b0feacbdffe7c7a25e9b7b858cfc07e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to websites that appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' specifically highlights links to compromised WordPress upload storage, suggesting a tactic to host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://dailymaytrogiang.com/userfiles/files/gibaxi.pdf In PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce6fe8cbed---91647972133.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/92700986655.pdfIn PDF document text
    • http://msiutilities.biz/documents/72979275724.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/16649199967.pdfIn PDF document text
    • http://iscelenie.info/files/file/33283860964.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/38374885940.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/31906936795.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/bugemasolojoleji.pdfIn PDF document text
    • http://cpviettin.com/upload/files/88969126849.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/80434001514.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/juwebivumezago.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210910165507.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/p7pn6qc9i5koo2adb24gqjiofu/xivekuroferilib.pdfIn PDF document text
    • http://sungwoo-n.com/userfiles/file/6109464783.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/wulesilaginupudatexagun.pdfIn PDF document text
    • http://jumpstart.mobi/userfiles/file/20589663291.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/lilolejufuf.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130f21190313---93885312667.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/gamixurus.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/52625947722.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090302321976.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146f2ef78cc4---xunukidedorebixemi.pdfIn PDF document text
    • http://fitviewer.com/files/file/60920428535.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/94945413519.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=best+sites+to+watch+free+sportsPDF 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_off0000b747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB747 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF59 14808 bytes
SHA-256: dfce4a3089bda572a4013fbd8a7833e750c08e5f996a6fd37c511f28220d0785
font_02_sfnt_off0000f4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E9 10564 bytes
SHA-256: c1d8e5c61ed74659f756186a3ca01bf442708744fa788ecaf1ea2d4a6b18f413