Malicious PDF — malware analysis report

Static analysis result for SHA-256 45d245e66d849b4e…

MALICIOUS

PDF

69.9 KB Created: 2021-10-03 14:12:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9c3995191094174551bbba6140f31428 SHA-1: 3cd7598825db45c172eb1c01e0ee035b229c04e9 SHA-256: 45d245e66d849b4e9bf5f2e01402dd7f51ef741e3147fda16692c0e06bb5b294
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to external websites, many hosted on compromised or disposable domains, indicating it functions as a link farm. The presence of these links suggests an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://montagnobozzone.it/userfiles/files/wugubadudidodesonamobu.pdf In PDF document text
    • https://tekartltd.com/upload/files/mevofejurofos.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/18446610077.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210913205042.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/28495506690.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/34391336064.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/66770767629.pdfIn PDF document text
    • http://rayanchem.com/d/files/lenusibabesewofesuverej.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2c3220ac3---sodazetadevigevobuwutig.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090518071233.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/36092345669.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614910d36cb23---bijudos.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/23995819871.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3509ad5b9---87554425589.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/71713624219.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/senutolanijokafu.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210926170621.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/riwakepegewenajilom.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/popesupefizukalig.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/xibiviwubitinenavanoz.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/22758250568.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///fiwabonimil.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/82780336512.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=cashew+nuts+bad+for+goutPDF 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_off0000b139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB139 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC94B 15560 bytes
SHA-256: 8d824650de0c01d809aa6d4def2fbfa09eb4f5533bf1e3f593d3e8f2703041c1
font_02_sfnt_off0000f0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E1 10852 bytes
SHA-256: 8d27694e5c8fd0077ac5ccf70b82a273cf470bf1c431a48558b31cdc4de1395c