Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d8490e4f7e440a5…

MALICIOUS

PDF

65.1 KB Created: 2021-06-18 07:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 02ec65e35485545d0ca8db4fa49653d4 SHA-1: f999913f9c3becef3a85a80d1229ef476f30e77e SHA-256: 3d8490e4f7e440a584b3956afe1237381e570d8b70e878b7f29fa166b0261eb5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress upload directories, which likely serve as download locations for malicious content. The embedded URLs, such as 'https://archism.ru/uplcv?utm_term=resident+evil+2+apk+for+android', suggest a lure to download an application, potentially disguised as a game. No scripts were extracted, but the PDF structure and URL patterns strongly indicate a phishing campaign aiming to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://archism.ru/uplcv?utm_term=resident+evil+2+apk+for+android PDF link annotation
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/cq6bb9re69rsdvchv0smotrmmp/gowutiridutupuxikonafi.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/1j7qfr1d544nc6sceqoejmp27i/zunijeziduluj.pdfIn PDF document text
    • https://digireg.dk/upload/87119451389.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1659e6cfd---vizuzedirege.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160afa2d97fe40---48857313315.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/64d416ca573644b89fc5bfead23293e3/21277477366.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/lesarironizakinewezeliwu.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b426de32d3---wikikigelatupuxupijuwuku.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/79280324208.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/sirunorewenolapepanigat.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/xafasubinagufewajugekabar.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/siapapu1qqbrlecf4005jpuj5n/85784927154.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3811815ea---18293742456.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1f3b379a9---zojexomebi.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/f523abed802c73f2ebf446532d9cda8a/92113492961.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/d0f6e80262a5a5bd490cc1655ba7746c/luleboratunosufovuri.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/ecvigeqgnmjqf6qq08fpi9i9st/wopoxinawinowotakoli.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/21106828791.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC027 5300 bytes
SHA-256: 8328fd61d67a107e3f7c3c38d291f8b7a6fcca2b2069bbca09c173a55b2a96f7
font_01_sfnt_off0000d246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD246 11464 bytes
SHA-256: 10efe49eb9429e9fb48aa716e0a92bbbced766d1a87a884208a20cf4b111c300

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