Malicious PDF — malware analysis report

Static analysis result for SHA-256 f109b5190ec1c256…

MALICIOUS

PDF

104.4 KB Created: 2021-09-06 03:19:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3818bf6eb5467a483a0c33ecafdfd0b5 SHA-1: 46f391704b943ebad500d0d86fed3eb73e685173 SHA-256: f109b5190ec1c256519bd8d75634e685ac593361fa9b8614469aad75db365182
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high probability of malicious intent. The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting it's designed to lead users to potentially harmful content or phishing sites. The presence of a link farm on disposable hosting further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://adepotcustom.com/UploadFiles/file/20210504103210172.pdf In PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/85236247649.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/87506712378.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e830bfd09a3---70604977054.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/kigorumupepavugo.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e305b9a57.pdfIn PDF document text
    • https://people11people.gr/uploads/File/50995318566.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef25fcd575---bosijevaxezemewaru.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/krbruskfaqercmiejshsjqokf7/30952679474.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610cc3f06454a---namew.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/ff13b61889db72f3ca3b10e767958ece/44152377491.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/72790487025.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/visagifonovizimewolufixu.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f79a37de49c---1551064535.pdfIn PDF document text
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/worumodatu.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/93499025540.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/5bmuodk72f0bpr8vghrvs9198m/20378904019.pdfIn PDF document text
    • https://claudiodituri.it/uploads/9744079167.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/47983847502.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/55267968330.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/72127280669.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/u73562p1t8gub57kmtrf3hc4k6/53706828093.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160719475dcabf---92706668316.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=game+of+thrones+guitar+quartet+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_off00012f3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3F 11184 bytes
SHA-256: e10021ae43295c75b2d8e6dac847d98c370ae535f1f0ee8ca16502352c8f8230
font_01_sfnt_off000148bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000160ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160CE 19588 bytes
SHA-256: 39161ddad404f2519f69ba8746dd5ffd5766277c08c42d4d352f818e822e5371

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