Malicious PDF — malware analysis report

Static analysis result for SHA-256 5630e1d1b6de5325…

MALICIOUS

PDF

69.7 KB Created: 2021-09-27 15:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2e51bda7701d365c280b30fe98dce9ec SHA-1: a3d03892ab33849586a0f7df78cdcb79df33e15c SHA-256: 5630e1d1b6de53256b5907a4fa024dc81869422b6d455b0e09a39701a7003d29
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615170a1a74b1---37913410037.pdf In PDF document text
    • http://surveycook.com/upload/tmp/202109/file/derifikanipolezu.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/kivesiketuteto.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/23545298469.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/samaduxuwupur.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/6f724b0570497ad4eca303013322b02c/5731596333.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/64716313022.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/baxises.pdfIn PDF document text
    • https://novsport.com/content/File/wamax.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/rojidewumisapiludu.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/74573497964.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/029f6v82s47bnr64k14di814op/wesewezutobu.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/bororebenuwukiradeza.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/15a7rcpapt4lju1llv0tr5jlvo/lewarideve.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/lajifasife.pdfIn PDF document text
    • http://secretinvitation.net/images/files/58550157765.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/44842612782.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/dizirudoz.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/99644154802.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/60763334411.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/81856747180.pdfIn PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/18936580014.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9e81991a4---77986505409.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/nipesefapez.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/kuvotidize.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=windows+10+april+updatePDF 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_off0000b453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB453 14316 bytes
SHA-256: f89cace9bcd2c3e3d2881f7d8cc70aaffed5ed16586c336407160c8deaedb0d5
font_01_sfnt_off0000d838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD838 10740 bytes
SHA-256: 6a5cbb8d11ce9baf40f0f2bcb1ee6f19cfec4f53fd45269e4449e9224ec8fc49
font_02_sfnt_off0000f116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF116 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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