Malicious PDF — malware analysis report

Static analysis result for SHA-256 7239a0f57f90d2c8…

MALICIOUS

PDF

87.2 KB Created: 2021-09-05 01:30:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 20730693cbe72cdc02be704a3f636e6f SHA-1: d59a42071ba2e6530854830b04cc5aa321e5eb87 SHA-256: 7239a0f57f90d2c837815a3dfe2406b1f6536004a65d28ea0b6757351eeab882
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs hosted on compromised WordPress sites and disposable domains, indicating an attempt to direct users to malicious content. The document body is heavily obfuscated and unreadable, suggesting it is designed to conceal its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://brownewingfamily.com/clients/a/a4/a4d7a48ed280e719b438ae57db99af5e/File/97100094064.pdf In PDF document text
    • http://food-cloud.com/home/food-cloud/www/site//site/data/files/4134812842.pdfIn PDF document text
    • http://lokale-uzytkowe.pl/uploades/fckeditorfile/30508793095.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eba3852e6e---64723468635.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/448529c0febd9c5e609417b9040286f2/jemerikikotix.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210901003623540.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/vaminemeruxota.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/p02udf7sjg512818or8tpa1t34/82005107218.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e1d391bfd---764379025.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/18316459561.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/towakiridapewebasaxej.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/9519e7e5c9dda6078443df27a82249a4/52585222211.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612511f4dc858---xegigalenutetugopari.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160afafde39152---93488348767.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/ginegulizawavo.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160b80312beeaa---kemota.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079fd24cafed---90502128712.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/0d004dcf2b2a4519c0e10c89030aca8e/ninikarelepowesab.pdfIn PDF document text
    • http://hrudolf.com/userfiles/41608635987.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d659410a9aa---94146353774.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/45496616162.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/82078195632.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=importance+of+consumer+protection+act+1986+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_off0000efc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC7 17284 bytes
SHA-256: 7bd643e49e6902517be2f14e020d8196ebc2e4981e7654fb02312a78ed0bf52d
font_01_sfnt_off00011c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C47 11380 bytes
SHA-256: 58c305b2d39556c7ca04adf5e95d6e5ee9af62724b1b168e521f328413495f65
font_02_sfnt_off00013707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13707 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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