Malicious PDF — malware analysis report

Static analysis result for SHA-256 949edf80c4251181…

MALICIOUS

PDF

80.4 KB Created: 2021-09-04 07:44:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ecc09ecf6850868396cc4663c8ac68e5 SHA-1: 3eaa490fffd1dc1bdff0f4d447c8c92595b3ca9f SHA-256: 949edf80c42511814728516892648a0b9055cc9b6dae4516432653df3ad3f36e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan distribution intent. The presence of multiple unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aaab0f99040---48106764420.pdf In PDF document text
    • http://fantalife.nl/userfiles/file/52921558924.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad771dcdea0---90062054456.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0724025bca---woxexakaj.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/8e0589d3cc2892498e45ef1d614e07cc/2689492248.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/44761851174.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/kajujir.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/faxizejewodudevemezel.pdfIn PDF document text
    • http://355353.ru/userfiles/file/nemaneza.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f571f41375---bopalekonelavil.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///47805231050.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/2434ae07e1f7cc793305dfa8211957b6/45014674335.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4e4f3e77b---wijakasugigonoke.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/27635900587.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/tatiwogiwa.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/74689059822.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16093acb60ad4a---zakuwevanizex.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/xifojupedezozigalasokiket.pdfIn PDF document text
    • http://www.centralperdana.com/file/tasol.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/65214254658.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/9e3d466e3033a30138aebe7210f7885e/mowejis.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16100d7fb66ed8---81927537184.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/vudukarabexexolujemevad.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/19755854293.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/34dec762c75a2b0fb755e0c052031460/saruvudasewuxajumudulib.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/6gkm84kfihn7nl96l7upe27u2r/68386533904.pdfIn PDF document text
    • http://stevis.cz/files/file/78609336547.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=music+symbols+and+meaning+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_off0000d3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EE 17736 bytes
SHA-256: 337fb0f9e392b4f30b6b16690050087a14ab703ec67044d94dc12dddd013a422
font_01_sfnt_off00010248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10248 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5F 11112 bytes
SHA-256: a9b5c5fd292d7c49aaec3d280bcb11407e9f5b378effce2079483f8e826126b7