Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2b4d8820c34b3c1…

MALICIOUS

PDF

83.6 KB Created: 2021-09-20 04:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c18db0b29a4166a4fb73c8f0e244a5c8 SHA-1: d457481654ebec5493c0c6124a49a222bc67cc7b SHA-256: a2b4d8820c34b3c1ed164374d23a01f53acad280cfd58c8eab7c13ff15324c09
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting it is designed to redirect users to malicious sites. The presence of external URI heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=best+haircut+for+inverted+triangle+face PDF link annotation
    • http://sweet-sugar.de/images/uploadedimages/file/79759793861.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/40129415840.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/nibomidax.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/30121528277.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bbd4c6249---40650195406.pdfIn PDF document text
    • http://etkenkalip.com/files/16013322182.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/siwemuribebixonu.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/kozarizujudumaxet.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/tixetux.pdfIn PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/nugojagomu.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/jutitaxaretebaze.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/38949100287.pdfIn PDF document text
    • http://zeci.nl/im/image/35073649905.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144c85fcebb7---kopewupusabalidudaxi.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/mapixanikolezokokif.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/noniji.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/97594413385.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/fukojamaxi.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/beguvamelekepitebukol.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/97451983232.pdfIn PDF document text
    • http://www.satunatc.ac.th/ckfinder/userfiles/files/50199276819.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/lozulimomenukejezulowujow.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161456cd1f22ef---dofopasabivupixamuzoji.pdfIn PDF document text
    • https://maria-galland.ru/files/file/pisogudij.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132ac74ac736---25447535668.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_off0000e27e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27E 17168 bytes
SHA-256: 18b8d6da9bddd2ae9502d8b3ed097ddf22c6d7483087dcbf75d6b712eeca6770
font_01_sfnt_off00010f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F01 10972 bytes
SHA-256: 31cf62c8782a8b164c233a2e56eed1f48af630fccd0647f216b2df2183dabfd1
font_02_sfnt_off0001284b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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