Malicious PDF — malware analysis report

Static analysis result for SHA-256 df8ffcd666854863…

MALICIOUS

PDF

82.3 KB Created: 2021-09-02 12:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bd20962a041a3fdf6e890ad1545f0e3f SHA-1: 5df968bd77de5cc71525e97ab0dad18ef2c361e0 SHA-256: df8ffcd66685486347075a31b66b1891b4efc0d534a3b3f8088cae50bb9ecca8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing content but the structure and heuristics point to a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://solarexperte.ch/fckeditor/editor/images/file/92392251069.pdf In PDF document text
    • http://planbmedia.hufiles/pozasitujorixozu.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/nekisosewi.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/74963839460b72e20b3363.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b8b03f89f---17613759525.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/81488507324.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/519422a8aeb3a4f4fc0395ef3c24726f/49744366189.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdd90aa3b04---suvafegi.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/porigajapus.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c406784ae15---ginivitamoxa.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/pd2dfrr7k75nqodn8vnm7ck8uu/zoponipozasetan.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/lexakureloredav.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610e3ba971ba3---daxelosugujudopow.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/20575201684.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/5205145956.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/27583500176.pdfIn PDF document text
    • http://sshs61.com/clients/6/60/60e739d5a8cf4a6710e4f064fd99417d/File/zerigijite.pdfIn PDF document text
    • http://honda-vo.com/upload/file/73955633277.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd9e74973d---nipaxebosirif.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/tosoxefemivu.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b14ad04f9eb---tejisiwivewov.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/famin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=kia+picanto+2004+repair+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://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_off0000d78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78C 10780 bytes
SHA-256: f1d1bab02d4773eb3413cedd76af375b1891e4f7fa68e1dd07a5f7934dec69c1
font_01_sfnt_off0000f067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF067 19612 bytes
SHA-256: 5e8d5aa4a50ab291dbbb836f9dd5d8aaf4e3f008c7f949be2cd30ec4680208c3
font_02_sfnt_off00012391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12391 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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