Malicious PDF — malware analysis report

Static analysis result for SHA-256 a84bdafd9d529c5a…

MALICIOUS

PDF

73.4 KB Created: 2021-09-20 13:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4fdabfdad4d21fc25fbd85254096cf3a SHA-1: a6448106d72aaa1b555b951d2aeee8ce5cb2a134 SHA-256: a84bdafd9d529c5a3aba007af465ecbec19748c1cdb66231a4b346b469c55aa0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • 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 https://catamma.ru/uplcv?utm_term=dead+trigger+2+apk+unlimited+money+and+gold PDF link annotation
    • http://logopeda-empatia.pl/content/file/67929523632.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/27890129574.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/sokegojini.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/42773596025.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/sigatujusupekiganipigaluf.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/73373764102.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210909_3F4A09C80F8660FC.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16142c17b6dc8f---famatawujemiva.pdfIn PDF document text
    • http://klinok-saintp.ru/files/92884277558.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/jopakunuwafamupisu.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210910062027.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/bimaduze.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/xasobodonomalorub.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613608eeda58e---60629525945.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/60182758439.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/gabiwiletukapabovixoda.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/48500466952.pdfIn PDF document text
    • http://becucci.it/userfiles/files/38242857396.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/de5b2294213b8c1aa8fb198a16750ed6/wesasevosil.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/34133921843.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/15084662398.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/56844485364.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/78420386693.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_off0000bb3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB3E 16548 bytes
SHA-256: f8f8fb829832c4fdda8b62a39c4cc3d1d096691a51d13bdf557afc3bc8361faf
font_01_sfnt_off0000e608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE608 10992 bytes
SHA-256: 7fbd1fc91eb77e48c117261bf4d94df37ad3ca2e7f2d1f6d787b6897898916c9
font_02_sfnt_off0000ff5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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