Malicious PDF — malware analysis report

Static analysis result for SHA-256 0556b392fa94f26a…

MALICIOUS

PDF

75.6 KB Created: 2021-06-08 19:03:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 228210929f91221bed9ffdc35a7a0444 SHA-1: a6d0a223ebf472f460e5b9abd6278ef65dfb7f0b SHA-256: 0556b392fa94f26ab0e072f339d2a89dd562ebd6a40c0947e0425e351e019d29
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=call+of+battle+mod+apk PDF link annotation
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb7c7ac38f---wagubevajopuwepazi.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/a6sedtbb11kr7ena0vippe1tpe/geminozusolazekogubemuz.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/n99fnbnb1i79q10ont80r35php/64843958077.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/77924438689.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/xirifirabulukulet.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210518005252.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec66a8c145---poxejif.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/671fb4e7f1b0a2ec55372e32bff7bb2f/37808608396.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/6db3c8ece72ef022d2d63455df2d4d33/ludewimupimafuvux.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/e5cfe39b30a3021c6ac745fdaf2edbb9/12277903720.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/20830259931.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/f62f712777a39ad5344792018b3041ce/23993409758.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/5862225911.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/873a9e72e168e4aef2102de83d0fbf64/84978410981.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/mlon2jrv3c6lordo111634sj7o/35463594693.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908814ad3bd---97054279382.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/bc3cf8b56eadac5f6b0f1d649583e864/sirokex.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773c7e23737---pikoguvosiburirugexu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCD 2960 bytes
SHA-256: a31aedb3fe800cd2b5c0120397ec9570e12c7cc97febb81e3d6171160c50e6bc
font_01_sfnt_off0000e74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74F 5020 bytes
SHA-256: e406379c15b2bf344bb77425472b80254b0a0ce16d0bbeba60bf07e3f701d36b
font_02_sfnt_off0000f850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF850 12708 bytes
SHA-256: a26b5ad540ebed7fe06881764bc44c88dbaf9c11139604b23503ea4a2a11d0a2

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