Malicious PDF — malware analysis report

Static analysis result for SHA-256 450751b25b63d026…

MALICIOUS

PDF

77.9 KB Created: 2021-09-07 21:09:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b8ff3e1e96993bf44c3cd85ca98139cc SHA-1: 461facc8b42548fc6137875572d013174d6e1168 SHA-256: 450751b25b63d02689a0dab1c0c4bc43b2531f89cb375a23990fb08ccce29f19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm, indicating it's designed to redirect users to other sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://catamma.ru/uplcv?utm_term=globalization+pdf+journal PDF link annotation
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/a133f82ce7a6a3f18af05edc1680deea/vevokefanagexafulexanas.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/50504175301.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/o74v8kq463plnjq88lj9ee4ka1/89989406130.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608339d72da1b---31063016200.pdfIn PDF document text
    • http://moje-stranky.eu/userfiles/file/nasuva.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/34005833881.pdfIn PDF document text
    • http://com123.vn/uploads/file/48981012662.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/3d61794456210abd72e446ca0d0566ef/tujor.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/varuvivavivuvufudejetu.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/94976505216.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/3cb8312e789098d6707d4459f865b662/jilaliximamog.pdfIn PDF document text
    • https://nieruchomoscikomercyjne.co/files/file/lobovetifusozuzukusite.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/salukevekinazekorawerup.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/94167110555.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/muvumuderejonabuxosi.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/fasokisunejol.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/911086203.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/lurubupejezav.pdfIn PDF document text
    • https://alibabaoman.com/basefile/alibabaomancom/files/62755508368.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/38609508935.pdfIn PDF document text
    • http://takemehometomatoes.com/ckfinder/userfiles/files/3443216000.pdfIn PDF document text
    • https://maturana.cl/upload/file/4721879266.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/96144016191.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c75172202---tavuwojuvabobozilu.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160becdae802a3---dolawenizutifatipi.pdfIn PDF document text
    • 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_off0000c668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC668 19616 bytes
SHA-256: 38aabecfdb08474a7a6867622d4ae4679317d9655b89c0cbff9b28ba541109fd
font_01_sfnt_off0000f932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF932 10660 bytes
SHA-256: 5a1be4482dd6ca8b2643d215384bd6e8544b8227f03ca51ccab70df6f4561d89
font_02_sfnt_off0001117e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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