Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ea9c066c3bb2501…

MALICIOUS

PDF

86.4 KB Created: 2021-06-10 03:21:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: cc750e895e32bfeccda049a3017d6d9a SHA-1: 090115eeb413a5e31e87e90b41a40d45b775cef3 SHA-256: 3ea9c066c3bb2501118fde8ec410fb1f3443973076c61eda38d1e14d357fde1e
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The document contains numerous external links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm or a distribution point for further malicious content. The presence of a visual download button lure further supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=private+server+clash+royale+download PDF link annotation
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e4628d3ef---3719511695.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/309e7d4943894f7e7c6c506ee65d137e/pomivuvosaranajerupaloxi.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/26783608650.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/tcakud4nuak252v3nhgpdatkc4/891167628.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/gimidujogir.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607034b699828---58385646184.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/44863565880.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/a376deb3d919b4df0ce3b07440d0939d/vojabafa.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/31308976265.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098af12582dd---filazaxolaguzigapudal.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/q1u3gkfeg48fc1u6mopdsojnka/zibematuka.pdfIn PDF document text
    • http://caryhigh1987.com/clients/41333/File/8964673655.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/28050752829.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/1e0958b066cfdcd28f749c88d2e9464f/zakixaligipatufenolapefob.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/224043ec20dbe15f8fee7b1443562ab9/61541584990.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_off000111cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CD 5284 bytes
SHA-256: b867fbf81ac8935c348eb366e13dea2a4f57d55768e97815390d019f65eacfa1
font_01_sfnt_off000123d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D1 11828 bytes
SHA-256: 4e99f98ec24cb1dceb99a7abca704bf4a950093361ccf88213e7e47d6f2d912d