Malicious PDF — malware analysis report

Static analysis result for SHA-256 859fbe25b7f96894…

MALICIOUS

PDF

80.1 KB Created: 2021-08-12 01:22:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f2aaea8a3bda2a6534b00b51b50b517c SHA-1: dda411f4ad4c608437a03e5bae1adea46fd7042b SHA-256: 859fbe25b7f968947bc1921dbc695dad47b872de94841870285d1aba499a92c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing users to multiple external URLs, some of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to phishing or malware distribution sites. The presence of numerous external links and the detection of a 'Phishing.Trojan' by ClamAV suggest this PDF is part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://rajatotogroup3.com/contents//files/kawireguz.pdf In PDF document text
    • http://archidaldegan.eu/userfiles/files/41615819150.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/4d0acc56c87fab0c6c02d77f35d4615a/65698436731.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/tezejinexizerapowo.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/rm8aqvbp963qmgst8pebfaoi8u/nagerevizapo.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/58856790358.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/57928541035.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/40700082038.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/60434936736.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/rakumaxilit.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/10240497577.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/dosaxifobugebil.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/18f67ecef72cda03a75467452a09fc02/12278225865.pdfIn PDF document text
    • http://manninareunion2012.com/clients/0/03/03b30fdf9aaeeba733afadbef254ff7b/File/52485816447.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/9104cffc74c45896974dfeead5c821a6/gotunelemufufefevufudamas.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/tegiwazedelumowewubivav.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9053f3810---rarusobugemexuv.pdfIn PDF document text
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/vomeneligiji.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/puwazekolareferozewuxe.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088df6c0300d---93438885908.pdfIn PDF document text
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/54818058419.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=expansion+du+nom+exercices+corriges+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_off0000d0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C6 18988 bytes
SHA-256: 1a86bdc257d59ea935641846b51edae424cc12ffbd1bde05ccd950554df69b7d
font_01_sfnt_off000100c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C5 11004 bytes
SHA-256: a849396db62d82b012cac6d3a05db68e83aa199e266762b95539ceabc58d8a0c
font_02_sfnt_off00011a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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