Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f791a5ce81d84c7…

MALICIOUS

PDF

82.3 KB Created: 2021-09-02 22:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1e2d01ee37999eb6e7e3dbe8dfbed012 SHA-1: da6ab1db8eccdf686b75dff0a8a26e92694ee93b SHA-256: 5f791a5ce81d84c74ee3272450f72cc45caf9bfa0fa73f74e5fca0f7bd21abf9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress upload storage and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://the100voicesofgospel.ch/fichiers/newsletter/file/xuriw.pdf In PDF document text
    • http://ohappy.org/userData/board/file/872967885.pdfIn PDF document text
    • http://pk.mo/userfiles/file/gobabuv.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/2021522053552462.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/vipurojipuxo.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/tomatiwifosilukobuturav.pdfIn PDF document text
    • https://artbynela.com/uploads/file/61421714899.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/851de403c5172da08f880479f45a0b94/bakupiremedirura.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/1ba2c514f844565d59baac00960cb618/6078840342.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1607f75ac9aef9---19106674659.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16129b0a0bac1d---92868075993.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/13169340483.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/640000dfcfe8afddab0db52b2776ae37/dokitedoxifikemajekebi.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/dasubowugodo.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/etp34olo6fuiv5h9n2rsauus0j/vakufipat.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087a30b19b0e---reniguro.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/ragiwupuxus.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/fademotuzif.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/84729319047.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/12b7233e049055f063b16c038db79487/29169919345.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094dd2d3bbb6---jodimubufizovupis.pdfIn PDF document text
    • http://ecole.ru/text/images/file/dazojisuwalexi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=sherwood+rx-4508+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_off0000d8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C6 10764 bytes
SHA-256: e3dfb45d9b95325e362ac92f5957f2bebf66beac5f183e70e429fbdd4e701512
font_01_sfnt_off0000f1d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D9 19416 bytes
SHA-256: c34403f46c469c7d134861ee9684ba8ba95b0e9a5b809f499bdbc0dc73416aa7
font_02_sfnt_off00012424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12424 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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