Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aa6da8f320d28ec…

MALICIOUS

PDF

75.9 KB Created: 2021-09-02 12:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f85d404bc3a4b3db2f123abab6ea00a0 SHA-1: 008bcf66d030918327d98141d00cdb56af88d01d SHA-256: 4aa6da8f320d28ec9c79e8470e1b704c3e22ac1125bece63a1d24d5210ca67c9
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://poongdung.com/FileData/ckfinder/files/20210609_3C2885A8631F22D6.pdf In PDF document text
    • http://chizclean.ru/files/fck/file/kebavafoditavotebinatufon.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/96313150734.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b5a94cadf---ruxepigo.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/feb0d48db4e71a77908935253d79da83/51757806303.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/pefozotawiwamimamawarozoj.pdfIn PDF document text
    • http://ddgasul.com/userfiles/file/41265599219.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/nedulokiramisobafe.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/17454604317.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/losaruzuzufom.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607672e9c573a---62834137307.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/depat.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/e73b3d44ec47ebdb38f4326e6df39180/tijalu.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/vaxupewisadobafolas.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/fagiv.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c68344d484e---78837954595.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/34299615845.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/25636356551.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/43617833427.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/nerubanelu.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc30edb5b8---kuzitosunipasivelebi.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/58956386008.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/bea54b50af71b0fca6313c97674d1f37/nezowu.pdfIn PDF document text
    • https://laser123.com/geektic/files/zafawejaliritometiseb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=photography+lighting+diagrams+pdfPDF 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_off0000c5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFF 10928 bytes
SHA-256: 6e916330cce62e890c4cc5796371279f81ef8d5490d662776389507d1cedf0d1
font_02_sfnt_off0000f6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EA 16708 bytes
SHA-256: 75c1183eaf858833c6ac779e136a579ca4e0100f9072ca09beecdfd0ac80a2e6

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