Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9d4ac0b1ba1c59b…

MALICIOUS

PDF

76.1 KB Created: 2021-09-16 12:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 651bbeeb3b566424ff1b8b37da88ac7c SHA-1: 9d435688d76c12aa916f24c7953829a7726370ac SHA-256: a9d4ac0b1ba1c59b8546d3d7172cf52e5bc02945e01fd856305a113e86c7e2b8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to domains associated with link farms or compromised content management systems. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery through these external links. The file's structure and URL distribution align with tactics used to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/69058407024.pdf In PDF document text
    • https://equinox-e.com/upload/UserFiles/file/zobogonorijozofir.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210907230637.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/32676241671.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/90956600370.pdfIn PDF document text
    • https://filetorme.com/upload/files/rotoguw.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/bifawapefepuruwadebofel.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/duvexebipuzubanirunapo.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/6g9e6qvdg2ee8gcppelmjjgto4/puwunomutetu.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/vukitimovuva.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/wowoxafutobelir.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/74280352445.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/gexifevowubugowezebepasad.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/48173082731.pdfIn PDF document text
    • http://adamex.ukrkarta.ua/fckeditor/userfiles/file/5093021332.pdfIn PDF document text
    • https://armature.ir/cache/fck_files/file/38619262735.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/5820006c5331b129933e453ca47684cf/kikow.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/foziporidudopurar.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/64292953258.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/161412b695441d---75709630192.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/rilisep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=data+collection+methods+in+qualitative+research+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_off0000c361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC361 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB73 17348 bytes
SHA-256: e05b9ff2248002cc0bd2ed8f9cb237e1be4378f9e22ff9f90bdff39ae18dc03e
font_02_sfnt_off0001087f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087F 11196 bytes
SHA-256: 6f099375453bf03ca5558a8f7a31ccaf002b02cddb585940d3e3eb34e73e8302