Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3f5752450830c3a…

MALICIOUS

PDF

82.8 KB Created: 2021-09-07 14:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8e1c411df1ea70519bf667abc4dcf833 SHA-1: b696557f292b4ce742cf5769d95a89e3db9f1699 SHA-256: c3f5752450830c3abaad47f1c3fa39dea158efee8860cace0f35df2fbf609f98
196 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous embedded URLs, many pointing to potentially compromised CMS upload directories or disposable hosting, suggesting an attempt to lure users to malicious sites. The heuristic 'SE_LOLBIN_RUN_COMMAND' also indicates the presence of command-like sequences within the document text, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.barbazan-debat.fr/ckfinder/userfiles/files/gejimu.pdf In PDF document text
    • http://wedding-box100.com/uploads/files/202108211905363797.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/kazibunigugala.pdfIn PDF document text
    • http://artside.org/data/temp/file/95967256317.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/93306127054.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/xeretiguvagemona.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/98209722197.pdfIn PDF document text
    • https://chris-arnold.com/userfiles/file/kirupekazazamafekemewom.pdfIn PDF document text
    • http://amdind.com/userfiles/file/46616711035.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/tavakarekogolatezoso.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/wifuvimug.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102c1288ce2b---59669470570.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/garusovatelugo.pdfIn macro / runtime command snippet
    • http://lobi.md/userfiles/file/vuvedugitugapeku.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704005065d5---jitigim.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/nizimevisut.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8ace5e279---mazixuwej.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/veniruvo.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bc3d4d69b---64526919369.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/8bddsqmb3ipsst18mpmhaorfi3/96677364432.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/53038421696.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/05bnpcq6ockr50qi8mndn6clq0/bugufejezoloponawetojive.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-2/20210902195923313019.pdfIn PDF document text
    • http://devison-matras.com/upload/file/54447075387.pdfIn PDF document text
    • https://drahmetbostanci.cIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=autodesk+revit+architecture+pdfPDF 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_off0000d619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD619 20848 bytes
SHA-256: 74f2a2fcb14d16570f3ea01e11b3d5d299001520b80d004e5c1b187aedfad848
font_01_sfnt_off00010c48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C48 10808 bytes
SHA-256: 42d081f5ce0c5d1c1765ef392d6113ddc8bcf826916dce69f439e123e7822e6b
font_02_sfnt_off00012570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12570 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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