Malicious PDF — malware analysis report

Static analysis result for SHA-256 b062de9b08e85b20…

MALICIOUS

PDF

101.5 KB Created: 2021-09-07 08:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e4baa598523cbfdbcf9af76b44bf1019 SHA-1: ce78af29711d1afb88d7d8d47f2ca72b53917ff4 SHA-256: b062de9b08e85b20420c6440af78b22dc5116bd8380a5ce1ad438cd7f655d211
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple domains, some of which appear to be compromised WordPress upload directories, suggesting an attempt to obscure the final destination or leverage legitimate-looking infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oroblupiscine.it/userfiles/files/29163107678.pdf In PDF document text
    • https://bunian-co.com/other_files/File/25200619113.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606eae327d18b---tijuderoja.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/baxutivikokomegope.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/ninofagovawapidow.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ef680bb48---suwumiwenomomaxibabi.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • http://hotararicedo.ro/files/files/tefowim.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/rogoriwujaworigu.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/14da42ad0963e1e087dc56ea6de02899/bilazemo.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/4cpi7a1d1jb122qkksiluaf2if/zelebixubosalolanowaw.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/logebelon.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/94956103656.pdfIn PDF document text
    • http://wamer.org/userfiles/file/59290226540.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/1aadb58e5ce7465a9eb01a66373a8bbe/7826699103.pdfIn PDF document text
    • https://actor-conseil.com/files/file/18293749658.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/ae3524a20146170ae912ae936ec3cc6f/wujuxew.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e79ca14eda---52937651670.pdfIn PDF document text
    • https://artbynela.com/uploads/file/76787383284.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f5aa5598c---jovewogudolegi.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/4be6b94d1fc62a2cbccb49b898c62fb1/puxedizigurotoserafujem.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160b5935254336---turip.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/f1ef0d723005146ff1491ddb7c5e875e/mopulibojabej.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/zukixelokutexetiv.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16135281e0254b---bafufabusobebenite.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=miele+oven+manual+h2265bPDF 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_off0001230e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B20 20272 bytes
SHA-256: 81f1bbf985babb75f0abfc05be4b36adfc6a41050265c4c7b5a09602ed6e91cf
font_02_sfnt_off00016f91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F91 10728 bytes
SHA-256: 72eccd990b3fd10e786c2ad0110f65027f1a32f03930d2b2c2db318d7f46175a

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