Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdde371ca0d1be5a…

MALICIOUS

PDF

97.5 KB Created: 2021-09-22 11:42:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5e40b5cf394c6eee24f720637b98dd29 SHA-1: 29849528e1a01071b9a7a0dad9883e2767d43c8f SHA-256: cdde371ca0d1be5a367036153f331cc12277421bdb294be0720c7f4e2ccb3d3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://maurovalleferroarchitetto.eu/userfiles/files/97292429298.pdf In PDF document text
    • http://skulpt.in/admin/uploads/file/fuvewobuj.pdfIn PDF document text
    • http://cpils.com/userfiles/file/jojirafuto.pdfIn PDF document text
    • http://handinks.com/ckfinder/images_store/files/26809671109.pdfIn PDF document text
    • http://midospa.com/upload/files/katufabi.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3f6038b3c---3567393705.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/73670660999.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/ditafatinotugefegigem.pdfIn PDF document text
    • http://abwessex.com/uploads/files/labajolozaxivusugu.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/wixeguxituleva.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/70227308540.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/62683083518.pdfIn PDF document text
    • https://drishtinetcom.in/FCKeditor/file/48436998230.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/laleso.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614a40934d69e---78250506122.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/webewu.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/todonowixukugazo.pdfIn PDF document text
    • http://otczenacts.com/media/files/tupatatixorut.pdfIn PDF document text
    • http://capri.lt/userfiles/files/13205701166.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613fac5a65bdf---milawafaxosowasevibiku.pdfIn PDF document text
    • http://elsped.hu/files/file/bexapetuvagubadixuwolu.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/wipinatodonedofura.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109081605257040.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=car+x+drift+ps5PDF 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_off00011449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11449 19960 bytes
SHA-256: c6ca43190b44449d3956876c41ef0860611fdc42dce5ed45b69062fc36b77535
font_01_sfnt_off00014937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14937 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001614e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1614E 10356 bytes
SHA-256: f2c80d3af192618f6d0f6a2ce40398ef4b6076254eb2b24ee9e2892cf68a3c74