Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3dd0409eeae702f…

MALICIOUS

PDF

88.7 KB Created: 2021-07-30 20:36:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fec68db059111db40eeabbfc64aa6075 SHA-1: 2b30f2ec441b80cb1ac1ba3b8967e793eedf34ba SHA-256: c3dd0409eeae702fec54ae0bdfb6836e30aa02b4bae78f87650a19c0652c84a3
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure and URL targets are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16084d3f0858a9---ditevofujutik.pdf In PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/dawolape.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/wedukidupikopegiwule.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/20849636404.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16094be2b876e9---bavivaxibaroz.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/42262395538.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/563vo8ni3achgqsj6m1v8av5cg/41205021306.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/5b806212f079450a0613708f6e63d323/lavukifezoxolabonavolapu.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c538463c6---61097992988.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/99eb6686702f6df3482f6487c82ec20f/bafedotuboragebidubemam.pdfIn PDF document text
    • http://dmscsmartlifeblog.com/userfiles/files/kizixozasuk.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/2198bb90807dd1cfc5e3de411ebf3abd/68139022540.pdfIn PDF document text
    • http://bakoca.hu/files/file/velogafafaraguxakok.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/sewozudanotaz.pdfIn PDF document text
    • http://mcutech.net/upload/2021/07/file/162690626678139488.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/9fbcca903f415215e9eebe6afafde766/72358997417.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/ctc29t1biorg6615vcp3n56ru3/xazexolesemafikudizi.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/dekopuxiteb.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/ip6cj5jgap5lf71scp4agrfimf/61480077215.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/67597331341.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e1d9c45a4---liwezujif.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/jatakatebitatifatijopuvif.pdfIn PDF document text
    • https://securitydm.com/slicice/file/bawalos.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/0d8e76a0b50fd4095f3ae32a778b0af3/rarudi.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/eqf8qqasms2ccrbn3rj2pgfcoq/fuxobom.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/577897694643c3c083e13d38cbeebd34/10998327175.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=programmed+and+nonprogrammed+decision+making+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_off0000f87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87C 10912 bytes
SHA-256: b7563e2be8f4a32140e697d7a99da8236462433b9e2088720a29d51df4a33c3e
font_01_sfnt_off00011187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11187 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12999 16192 bytes
SHA-256: 684add40983a717e0db61ded710d987b0b080aa7032d22d15e342566240b8819