Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7652d4f52c084ce…

MALICIOUS

PDF

101.1 KB Created: 2021-07-13 23:24:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ccf557bac24a4f6a5e3d7d5d65e0f7f1 SHA-1: 15bf83ad8d36cfcdaf851e5739491d251aee1b62 SHA-256: d7652d4f52c084ce26d5894090c6198243e49a0dfae0a8c35518269f755c901e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to numerous compromised WordPress upload directories and other disposable hosting sites, suggesting it's used to distribute further malicious content or phish users. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

Heuristics 6

  • 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.
  • 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://wsm.hk/images/files/87534977668.pdf In PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/86da7e54b6a53142479fd90ca81e0e69/jasilagalejuvirusunifux.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/gifelelax.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7b9ab4ba2---3596516259.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b6021b3f49e---durajobonabozozifadugofib.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/95526932124.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080efb006755---60587203988.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9eaf7e7b6---gijutimojagazimanuremowe.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/66753663058.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8771267625---dudamamelobumefi.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/witibuzigebozazekuzuk.pdfIn PDF document text
    • https://filetorme.com/upload/files/bebojuliwetuxati.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b8c13e197---gidividi.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16094b076c9c75---43028538439.pdfIn PDF document text
    • http://netflor.pl/upload/File/32636051536.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608064c002cc1---ruxolimezene.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/66953712355.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/1c576u2opgj30m2o39ekms4q33/28588038192.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3e7d91c73---mexijiworapowipad.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/93426673524.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/fudaditakifelekuxezazinog.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24181b26fb---62686790126.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/nuxasejikevenufavofu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=beta+pleated+sheets+are+examples+of+proteinsPDF 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_off00012138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12138 18824 bytes
SHA-256: af17b2ae5d7a4ce29feb9a81bf91456681f1f01e17e4bf1a70e9e429e60f2ccb
font_01_sfnt_off0001539b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1539B 10920 bytes
SHA-256: 3a3aaa315bfdb76032fa72f7c0db4353126978e8e8e8a3fe7f67127afb265404
font_02_sfnt_off00016cb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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