Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b6947f9b4961605…

MALICIOUS

PDF

81.6 KB Created: 2021-09-04 21:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1661673cd0fd3d088719a0d1ee8d6378 SHA-1: 0210321007bfc542f881a6d98992efd9d5b2de94 SHA-256: 4b6947f9b49616058a56933d30f5aed66111f9089e1fbef9df340f03d9959842
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised or disposable hosting, suggesting a link farm designed to distribute malicious content or phish for credentials. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://pistant.ru/uplcv?utm_term=english+grammar+test+b2+level+pdf PDF link annotation
    • http://duda-tech.pl/dudatech/upload/file/rubawakepazanezudukowofed.pdfIn PDF document text
    • http://skomi.ru/img/files/file/96244797672.pdfIn PDF document text
    • http://www.bash.cl/media/file/13136559871.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/79811451958.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/zikizasafosatu.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/3030463657.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/14719683267.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/37550547103.pdfIn PDF document text
    • http://hopkinshigh62.com/clients/7/77/7764523e397120ad9b09b1da26998858/File/86193163713.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/4348738345.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///58249971623.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/65764443553.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607183468f64f---bepuduzaxejiru.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8a72f8d104---82320218798.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/somufi.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/btmnt5msodo151c18keoje8jj3/29165838483.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/34526588748.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/bk4ca1vv2l2m9op6sn2rm408uh/tuwugajufuru.pdfIn PDF document text
    • http://zjgjqmr.com/v15/Upload/file/2021818235707708.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210629120639884.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/xitorugomizanuxudusiv.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609491de90f2e---4515563110.pdfIn PDF document text
    • http://iwishop.hu/file/vuvunebufibevat.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/8f6120657e12e0908263b2efb77249d4/56248409352.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_off0000d7bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BC 18204 bytes
SHA-256: 007719de006c5f9f73f454d6ee84c5a7655893cba104ecbae7565b65d317ffbc
font_01_sfnt_off00010700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10700 11136 bytes
SHA-256: 2fa471f17b13d2a5a2e079d89440c6840e8db5c383c9599ac5d494a4500609d7
font_02_sfnt_off00012065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12065 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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