Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2824ebee505406f…

MALICIOUS

PDF

86.8 KB Created: 2021-09-13 10:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 793e4fe2d8bceac378a9007f25709938 SHA-1: 1602eee84fe63d8788c2c87158291bfaeb64b141 SHA-256: d2824ebee505406fb9f373044ca7888880060a333ff68dce199bd5b403e7b78a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host further PDF files. One of the URLs includes 'minecraft+latest+version+apk+mod' in the query string, suggesting a lure for game-related downloads. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high likelihood of malicious intent. The presence of embedded URLs and the nature of the link farm suggest the document is designed to facilitate the download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://wastran.ru/uplcv?utm_term=minecraft+latest+version+apk+mod PDF link annotation
    • http://sumbulefendiegitimvakfi.com/resimler/files/76885104075.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/rotexujitugilus.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/a9f8ecf0c87712cb098be53d6eec6625/23880233544.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/ronafipiwotuviv.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/47505565113.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/80845338440.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139658be411d---nekenuwita.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/tivofonijati.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/3350848328.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/60110485466.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/pazelolo.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/sogurinifizofokulijesa.pdfIn PDF document text
    • http://bibikid.ru/upload/71792916447.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/14753489061.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347c6e94782---88118035594.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/tugiragekewatino.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ce0b600cf---wifofedulawejugelogu.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202109030212037469.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/161306b6861bb7---57426295712.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135dfacafa2f---zuvuxagowilinagofixefiw.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/52397850990.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/vunuvo.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/8315d304c424e1d9a5a45f45475d5807/10638332741.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/valugumokigepalon.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/17114793468.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_off0000eb81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10398 10932 bytes
SHA-256: a2ba5b06b372497b8730cd7a66dbb05e73038b55fde761cf026169ea1ce5c2da
font_02_sfnt_off00011cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF4 18748 bytes
SHA-256: c9cd715d7e474f4d664aa22500f0b7473ce58b0f3c12f05b87497bf1eaf0a3a8

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