Malicious PDF — malware analysis report

Static analysis result for SHA-256 a286bf352b0a3153…

MALICIOUS

PDF

96.7 KB Created: 2021-08-02 21:10:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f998b9e68bff4adb5edbf21e3db91e45 SHA-1: 5a52440b174ad8f9a10a3d4b2480a1253bfa3d1f SHA-256: a286bf352b0a3153a6adb9bf02c017270b746452e32411c18b0f43ff865a06c4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://aloeverajuice.cz/files/file/lalemefoba.pdf In PDF document text
    • http://cloverpark1959.com/clients/51168/File/24395744375.pdfIn PDF document text
    • http://deforma.it/userfiles/files/wiwerupubulexepososaxaxi.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/kurolive.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/pepese.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160db28953defc---90245544376.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/rofurifefazokirugati.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/rikibokakugivujikedeso.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/xadiv.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/31521916200.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/75e716c2c4a0ee3811ff15db885d5d98/6517993072.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076b40dcd104---16151734103.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a526ba48fb2---56113567238.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4b2da11ab---42916366560.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/61195047804.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/o04ojthcrdhheqaeicbl0qcaid/keligaveroxofiselixoxu.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/37429312299.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/xitajebonirilerowozugumiw.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/mpjpqgop6nsn8g9akrcmsenjl7/98071519553.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/70609120983.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/pr581l894pet9hrpdvl5a0eh01/fipiluwudevobalitet.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/27459085626.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608073633b181---bizonosonabulesaz.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/652ba5c55e2548df1cc800652e4533f2/vilot.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/zufigalutivexuwed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=como+aprender+lettering+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000facc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACC 19752 bytes
SHA-256: d6e0e28c763945de1837b6c454cc6f9397683b4d2c07862f38b0657c31e96702
font_01_sfnt_off00012b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001439d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1439D 16340 bytes
SHA-256: 88a5f3ad9079b2340172ecd64f1cd79ba1ad1753eb2b73e58de10c5a7be67d15
font_03_sfnt_off00015995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15995 10704 bytes
SHA-256: 7f1c5c64f63220d4059482434e58b377c6aa70f3e5c48007f7d14b82c21e3cc0

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