Malicious PDF — malware analysis report

Static analysis result for SHA-256 a85d9dab44f92bae…

MALICIOUS

PDF

100.1 KB Created: 2021-09-19 15:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c7434e5be529d95fd4ba145d625a5e83 SHA-1: d7089b2ae12583b3b33ad37df5a03d9105d8ccb5 SHA-256: a85d9dab44f92bae1abfbe5594400dddfbf4b4cb3596b92fc9b08e45eec86790
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which are hosted on disposable domains or compromised CMS upload directories, indicating a link farm or phishing lure. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=golf+championship+2020 PDF link annotation
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/65244760950.pdfIn PDF document text
    • https://euinsuti.uniluxgym.ro/app/webroot/files/userfiles/files/97519637420.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/202196125212.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/dimifekosotakilamu.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/7c46c43ecf6bdd299b5664f51ea20514/98872401199.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wajano.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ea9632667---3214608144.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-13/20210913142517914686.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/wezevi.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/76059291720.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/bp9kmev4l90lafhd7ntvg0as9p/viwumebomujawexiro.pdfIn PDF document text
    • http://philipsphotographystudio.com/gilojaginupabironu.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/difuzorofelawaluvi.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/zesamigagakeji.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/161403a2957a0c---nebatobaxed.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/7975176794.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/4tbt71md3redvt4dvsfa0cbpph/80627739844.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/filidifaxufenovitepike.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/87048332539.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/12557123794.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/mefuranibuvanevatabipemup.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/28157739631.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/36305991038.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_off00011fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA4 19460 bytes
SHA-256: 427352cbdf191bd2214314144a47c6d4f790b227590d6d0988f3c81bc1483606
font_01_sfnt_off000152fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152FA 10696 bytes
SHA-256: 4c07ef23e6e3949b14406ed350b8d44c9a7d86d48a5e5d59de04b63caac96b6c
font_02_sfnt_off00016b59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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