Malicious PDF — malware analysis report

Static analysis result for SHA-256 35bfa16a2e6ce3d1…

MALICIOUS

PDF

85.2 KB Created: 2021-08-31 22:30:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: e490a109b8adf2441cd00d8d2c9ad79f SHA-1: 49700af62c4ac0909f7cbf724afe671f08b8f767 SHA-256: 35bfa16a2e6ce3d1ab2fcf542b71e2cfa17df700600531f3574bc6394e0e1ccb
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 0.9974

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://krisoc.ru/uplcv?utm_term=of+346+army+fillable PDF link annotation
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210806110619.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdf636c222---59036562780.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/rilomadubamogako.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/70688524684.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/norujanofonexebanopil.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d0142fe1b---wojuvesugosurepowibok.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/revegewisokitaka.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/jekido.pdfIn PDF document text
    • http://dzbnf.com/upload/file///fozopunarit.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4069576521---wonorijefa.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/fodakos.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098756e24445---39798773352.pdfIn PDF document text
    • http://timesofbangla.com/uploads/files/basekolo.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210625020441911537623.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702c7433101---tikujoduvivonokame.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210512041905.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210803025647_kol4p7.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/8df3f6c52948d9410eb12b937e831841/202259492.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/67198801988.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160b49755a9025---lomokadapotufixaruda.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/towuganupebotapasamo.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210813101909.pdfIn PDF document text
    • http://klenderbio.com/upload/files/60928743276.pdfIn PDF document text
    • http://woodsfamilypride.org/clients/2/2c/2c83419adcf4927d74d3defe18342386/File/7841019062.pdfIn PDF document text
    • http://lordbeaverbrook1973.com/clients/76835/File/20117911170.pdfIn 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://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_off0000e9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BC 17564 bytes
SHA-256: 459393c58781d9160910a6fbdd04628d4c2691e628663b0ff26ad3ff93e134cf
font_02_sfnt_off00012f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2A 10580 bytes
SHA-256: eb953fdca9c60fc5877e9c53a356af499d3cb5215b79e7be7e6c0d45007e8d08

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