Malicious PDF — malware analysis report

Static analysis result for SHA-256 29928d29f5c98265…

MALICIOUS

PDF

83.3 KB Created: 2021-09-21 01:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 69d7c53ed4db16ce0f37067cdef376e3 SHA-1: 578b4e0317d2631c7fb8b72949cc1c17f6daec96 SHA-256: 29928d29f5c982653547e52c9c86be5dd9f06ef94b288d257cb00ffa8ce97a97
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing malware. The presence of multiple links to compromised CMS uploads suggests an attempt to leverage legitimate but compromised infrastructure for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9852

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://cructi.ru/uplcv?utm_term=ionic+radius+trend+in+periodic+table PDF link annotation
    • http://bargiel.com.pl/ckfinder/userfiles/files/78977197470.pdfIn PDF document text
    • https://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/89175363665.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613d970b3f4ae---gidiru.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144c3ba5fc12---wikuwimebugojediwo.pdfIn PDF document text
    • http://cataga.de/beta/files/file/86434710489.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/wemuwedowakap.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/tesufuni.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/44006973132.pdfIn PDF document text
    • http://sbkf.org/files/files/rilalikoka.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/tazijedawitinakutapof.pdfIn PDF document text
    • https://arerp.kr/data/file///6459706713.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/sufexezurojazujapenal.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/161328bdfe0f8e---93380081882.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210914_87D6D0F3F4E3B674.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/22365018204.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/16436387523.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/940433fe586b155c08cb8522c1fb1d5d/juboxefum.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/wurusepukumasexolu.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136e84350fec---zawuzaz.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/galevowugimo.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c29b585a23---mivawaxuv.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/xufikewiluz.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/xopesag.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146e3d8d39c3---sojekipux.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/guzopofiniwopuvuvew.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/dekivamiwifotepikef.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_off0000e1d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D7 17376 bytes
SHA-256: a099fb77487099684d36350d15864452ae5f02e0a4d673ee0690c948556ba828
font_01_sfnt_off00010ec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC2 10696 bytes
SHA-256: 3a7c11e731814cd75f8fb8a947fb4b499484bc10925ab7a955736d791a1d3aae
font_02_sfnt_off0001272c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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