Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a192d4c5d194bae…

MALICIOUS

PDF

82.0 KB Created: 2021-06-18 01:42:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 58aa45c242cdfeb3975d42618b3fd7db SHA-1: aaf8f462e35b6cd6de4787dc28b1cf164190d152 SHA-256: 6a192d4c5d194baedf4644a7a4dff4cf8053f58c33c4246b92375adff938c9d6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites, suggesting it is part of a link farm designed to distribute malware or lead users to phishing sites. The document body, though heavily obfuscated, contains text related to downloading poetry, which serves as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • 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://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/pmn91k7miekk8n97tkfdbqjrhh/luzitufoxekusolukin.pdf In PDF document text
    • http://k1a.ru/images/files/file/rupagadetafezetu.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/wifexojukotubupurumum.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609986d106dc6---vujebixarige.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a83cf8a668e---biwivirogixilegajun.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/3oadhgqbnlm2rh6d5t0v1fcb2j/9271080687.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210524/210524225933084411gbnpacurrjkd.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3ea2b36a1---bafodoguxawalixepasuwuneg.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/fscdnjf0pmb5di933qhmbr9qd2/zedufoguvenofibuvi.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202105/file/1620596503.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/72905106484.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b6fa60bad---18586848209.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/66b6b9fb736d20a9ad62ac89831aa0c5/19408106624.pdfIn PDF document text
    • http://instandee.com/Images_upload/files/dalabaxopataxosujomir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=bulleh+shah+poetry+in+punjabi+pdf+free+downloadPDF 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51E 5588 bytes
SHA-256: d59959581d84e6471f2cf78fb3be84dd436cb541740176b57638a490341090f7
font_01_sfnt_off0000e82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82E 2900 bytes
SHA-256: 96c7c6b654e7d47e4bb6116aaf99c4a107d5d60f8ee8ae2fb44675fc21a525d1
font_02_sfnt_off0000f481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF481 12732 bytes
SHA-256: 2fe1eced27d0508a68cc8b89211da278dbaa5d3ca3c7d7f2fa50c6befcb20950
font_03_sfnt_off00011d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4E 17796 bytes
SHA-256: 4eff19a610098b42bac27d74e70fa7b1f63459937ec6efd4014e245e19ffa1c4

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