Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdecdc4b0173010b…

MALICIOUS

PDF

80.3 KB Created: 2021-09-12 13:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0ffcf188a37b20a341505c66f34b0f34 SHA-1: e88450fe115f8ae4ecb43df6a02c4d5e8e17acdf SHA-256: fdecdc4b0173010b9c34c21666c0ca45774f2cfe99202884d3108469af84075f
196 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that redirect to various domains, some of which are hosted on compromised CMS platforms or disposable hosting. The presence of these links suggests an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://congluc.com/upload/files/10766113768.pdf In PDF document text
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/40882676160.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/zirepiwememirixob.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/puwulufikofexoxenen.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/binatovexor.pdfIn PDF document text
    • http://wenxuezj.com/images/File/72633434371.pdfIn macro / runtime command snippet
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/25657363501.pdfIn macro / runtime command snippet
    • http://africalegal.nl/userfiles/file/jejubis.pdfIn PDF document text
    • http://afro-safari.com/upload/files/feviduwesejo.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/jagifimoleno.pdfIn PDF document text
    • https://revive.fashion/upload/files/13572479566.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/tisaderim.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/lofiboku.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/fusuliniluw.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/sasezuwidevutekalumegur.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f14ddc11ca---tomupireruroladoferamob.pdfIn PDF document text
    • http://live-net.it/file/misudizudobopatalulem.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/19583586780.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/4399500483.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/fosagekuxekitinikigiki.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/68100845151.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161319b650b697---93638001684.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b64e7429eb---82212741416.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/81758588431.pdfIn PDF document text
    • http://superfisIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=app+cloner+premium+old+versionPDF 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_off0000d692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD692 17636 bytes
SHA-256: e96fc1a8f071159eb134f991b2e17cb98101c35a9a11a858d40a78bad72b1838
font_01_sfnt_off000103fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C11 10564 bytes
SHA-256: c27c717b78ea3cdf77658776e16be580fb1dd01eaf258a87984210df5d03a147

Open this report in the interactive analyzer, or submit your own file for analysis.