Malicious PDF — malware analysis report

Static analysis result for SHA-256 d64fb9f2529f260f…

MALICIOUS

PDF

78.0 KB Created: 2021-06-20 13:59:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: f4efe9020ca0eeb4a86d950a8cf8a4df SHA-1: c617859ff829227f9284fb213ddbf2e8ec080d6c SHA-256: d64fb9f2529f260f2ba6b693159f816cdc9a1e28ad801f082d75b63ca9464322
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised WordPress sites and disposable hosting, suggesting an attempt to lure users to external content. The presence of embedded URLs and the PDF's structure strongly suggest a phishing or redirection attack, likely initiated via spearphishing.

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://coretry.ru/uplcv?utm_term=chandni+chowk+to+china+123mkv PDF link annotation
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/4a1b7526a8d72803e2a473a2ff4ebaf9/fejepamupevevo.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160721985504e2---18733619198.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/rekanogejanawonuwemib.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160895ed693635---8596837747.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/1a1f534282a22a60568b91351efc502e/52439284247.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/givatobolisizulafa.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/zonokutorakubiderete.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/31944935693.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29d4688d35---bapewimubupuwuv.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/5347619dbe889261651e91004cf35ec4/11886355672.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/vajivonobakerala.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a42b3e8c62d---95116196174.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/73a45d1349ee1ff964db6bd82819d49b/78784146547.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/25fd6f2f36538982039a38e22148e6b1/sawifirabovewa.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/42928067830.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
    • 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_off0000de02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE02 5344 bytes
SHA-256: f957d6f8e65fee618c9720af398fd4fc0300adf31fc3e198b546f643af06b2b8
font_01_sfnt_off0000f029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF029 10940 bytes
SHA-256: 8f2ccf9f0c8f54d29352b2a1754cc35cb22c8bfa2e5b1e131519cacb1604542c
font_02_sfnt_off000115ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EC 16164 bytes
SHA-256: c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e