Malicious PDF — malware analysis report

Static analysis result for SHA-256 57dc58d38c7e8efd…

MALICIOUS

PDF

105.3 KB Created: 2021-06-24 15:42:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 57539e517a6bed6dcd7d98635cd1ede1 SHA-1: 5edeecd8ae5e87054997e9296a17365a2b7ae5d2 SHA-256: 57dc58d38c7e8efd5f3a1fe7967da7c8e3254187a83356647e360cc245f4dc50
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, hosting numerous PDFs on compromised WordPress sites, likely to distribute further malicious content or phish users. The presence of multiple links to potentially compromised upload directories suggests a coordinated effort to host and distribute malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c60db41932---zakimisejolelerolowene.pdf In PDF document text
    • http://ruoumoc.com/upload/files/mexevefopibavajokik.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b64a635ddc2---38312918502.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/dd6094c122a19c6e1bc6355081862ab7/jofuwirewujedin.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/beb1a11921eb6e4dc2fd93c09dedd28f/najazipolenowobazisixipi.pdfIn PDF document text
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/ac88446834645e7f81409be58220a40b/filidujodurimizogixulinav.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/3ed9206ca5fcf2cd6fc5209d8d828a18/94329167629.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/n9p3qti6h31niv7hm9md5t8vo1/bebajobojudir.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/84f6674f35556d35728606c16dcdaaff/98727950768.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfddcc14c0---89030824388.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/29t8n51mrjriuvo0h52rptpbm1/21457024357.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/78503372342.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/tonifadixepuzakavit.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/gjmhuqcot6jm5uotlpnmvokmu3/41835936677.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=gskyer+telescope+70mm+manualPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BB6 5496 bytes
SHA-256: f0c8277b9a283190173ff92253de6842350f3f50ed17af517f6beacedd144edf
font_01_sfnt_off00016e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E68 13340 bytes
SHA-256: bfaa66363ef6f866d46119943c952849b48c9fa9f4272a4999dd04d1af53544e