Malicious PDF — malware analysis report

Static analysis result for SHA-256 eca6a8bf5c5eb054…

MALICIOUS

PDF

80.6 KB Created: 2021-09-09 15:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7b703db663871e9d02178d54ffa967a4 SHA-1: 4d4f0c002df867daff2adaa5d53560d4230f02ca SHA-256: eca6a8bf5c5eb054f493bfeca07b43ce71813ff11cc5711efade169c05fe9422
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure indicate an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://print-printonline.com/ckfinder/userfiles/files/13217169071.pdf
    • http://springgalleryng.com/Images_upload/files/42191272175.pdf
    • http://saint-party.com/media/file/zizazoserasuno.pdf
    • https://fasaac.org/temp/files/lilukosufufedujutunifaj.pdf
    • http://space-edge.com/upload/files/totigevuvojawuwedufug.pdf
    • http://pelejas.com/IMAGENS/CKFINDER/files/17598792683.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138401da8d72---siwenajitukikuf.pdf
    • https://takarasushimn.com/userfiles/files/94442934458.pdf
    • https://nnt52.ru/userfiles/file/vejozumasamisum.pdf
    • http://ambvet-trefontane.eu/userfiles/files/24811679132.pdf
    • http://shinies.ru/img/lib/file/biruwuzusukakogujinemidik.pdf
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/jaguso.pdf
    • http://df-2.de/images/daten/file/19348199186.pdf
    • http://stluciachamber.org/uploadedImages/contentImg/file/46637518727.pdf
    • http://ddservice-bmw.pl/userfiles/file/fodetativovuvas.pdf
    • https://thailonghoang.vn/upload/files/fazazixo.pdf
    • https://bakotech.at/uploads/ckeditor/files/goxirogidarax.pdf
    • http://chanakol.com/ckfinder/userfiles/files/vusurejesudipupig.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e86252a8c---73361667187.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16135308e3a1dd---venumeriwufilivebaw.pdf
    • http://newkontakt.ru/userfiles/images/file/52412416572.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/b17d8897af42dca53ce9e08426e2fbbe/73007047831.pdf
    • https://creativitagh.com/pevron/www/img/file/74261700106.pdf
    • https://gizaviation.com/uploads/files/tujedisusetapujik.pdf
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/13167983421.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=new+movie+maverick
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d859.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD859 16792 bytes
font_01_sfnt_off0000f06b.bin
7757c3aad0701a154417118a198e5754976c78bffbe0dedd687fa5e87e24224e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF06B 17684 bytes
font_02_sfnt_off00011e36.bin
b1f328591d9329df3acc5855df5c55d95a7279877f37c95e79dbaae6b8e4017b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E36 10196 bytes