Malicious PDF — malware analysis report

Static analysis result for SHA-256 09a4cd813295f3af…

MALICIOUS

PDF

89.7 KB Created: 2021-09-05 03:28:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6c3a6b51ad75fde0dca6ec2071d6cd33 SHA-1: 28a2dbf9f5fef36af0360f0526b675ae333dc9f7 SHA-256: 09a4cd813295f3af313a23eee2db1c458943a0c64d75c1207b3328f8c3080677
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and present these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb93a3fb05---72853944921.pdf In PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/50904604936.pdfIn PDF document text
    • http://one9five.com/userfiles/files/mogabifijalupizaz.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/wutojorixujitoro.pdfIn PDF document text
    • https://ptogel2.com/contents/files/9479769643.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/46781623648.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/buzemixovonivol.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/pivovevidepikip.pdfIn PDF document text
    • http://distributoram.com/files/file/29373287465.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/zorajuralagokadanogodad.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cb7dd3e1a---moxebilekutezubule.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/cfa9d1af7474da07f835c290b08e63e8/salexobubakenosofexebu.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/cb84d25eeebfd17e8edaa2ebe2c4bcb4/jipawufepanurededi.pdfIn PDF document text
    • http://auldskoolrocks.com/clients/878384/File/93289425606.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d15cf12d7a---modiwiviruf.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/nvbqnqr90u0qbu76jipjt47q5o/zegijisevavasanamuzus.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/8929342571.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/relufamumuve.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/68835616062.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/zebelilejaforonibeb.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/nj7c9ca44nhbskjvcgg40bp0v5/wakugapibaliporipixud.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d82508ef41---betavakoxerisilo.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/45165402760.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=paris+metro+station+map+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_off0000f879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF879 18744 bytes
SHA-256: f9887aeba71231a5e797e4107659f49bb612938a5c7c964f444c633bafa2f9df
font_01_sfnt_off000128f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001410e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1410E 10612 bytes
SHA-256: 23e096cadbc7fd0de7057566a63c2a184eadcd8e97c3149755950ed31f49931b

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