Malicious PDF — malware analysis report

Static analysis result for SHA-256 2681a152f07b7629…

MALICIOUS

PDF

81.5 KB Created: 2021-09-07 00:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: c2242c87b769761356f5eb2cfee95b8a SHA-1: 2523f400a5321effceb0eddad47b4a81cab34620 SHA-256: 2681a152f07b762922d76fa9674ed15edeb7bb7aaa9bafb4bf4f8b483affb91a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://amongelite.com/ci/userfiles/files/zatanutajef.pdf In PDF document text
    • http://mamtomchabahai.com/uploads/files/files/44467005974.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210730_E4F3946F0291FF6C.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/d17b4ec82d9019e636372937deceedbe/53239308972.pdfIn PDF document text
    • https://basisangka.com/contents//files/85936215798.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2jnna7p7odp5csp98437cadq71/3829817555.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/12859313351.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/37743379346.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/fozuvoxiguwu.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/xusupadebijugekiwuribiviv.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16085a665d5396---sojorigafapiliki.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/zevotin.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf14362f67---sasurigexajapebub.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/ravofoter.pdfIn PDF document text
    • http://hydrem.ru/images/file/662310763.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c131d51fe45---xenigojafepibumidow.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/29144984728.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sezolemiverevux.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/4ebf7e3580af6402920b34328719f77c/74115246071.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/nonoxawopepaguso.pdfIn PDF document text
    • http://synergyproperty.com/images/files/30309615338.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/4f7fc5b1ccd055545bf409a7de515b0e/11943322078.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/394ab5a31f8769789e503ee7490599bc/9480828927.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=pdf+to+editable+pdf+converter+software+free+downloadPDF 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_off0000dbd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD2 16488 bytes
SHA-256: f75be3c87bf3939ed0135728795c4a3f56f674281753073b7d172fdceef73921
font_01_sfnt_off0001068e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA5 10904 bytes
SHA-256: 259fd8856d873a1cb21e85ccc660d655b4bd0bf86a0523b36ea8348b418e7357