Malicious PDF — malware analysis report

Static analysis result for SHA-256 0950b657b8365fd3…

MALICIOUS

PDF

76.6 KB Created: 2021-09-13 12:28:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 39dd29de2808f7c6d6f45482917fc9ce SHA-1: c02cf94e2d0e47875f22c126b65c3d31a99b264f SHA-256: 0950b657b8365fd366a42d4fa3d733b548308db492d0ee26abaccd8ecd50e548
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for human readability but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/cd450f72a7ff82728d37d65c05d174b6/25586962336.pdf In PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/70895469486.pdfIn PDF document text
    • http://bamor.org/userfiles/file/samepidofuzab.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/12807846938.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/51741198353.pdfIn PDF document text
    • http://15881588.com/ckupload/files/xumiv.pdfIn PDF document text
    • https://uangraja.com/contents/files/wavipalapopoluwizagunire.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/50317964933.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/majapabetunarovenuxinezik.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/zoxilesolewatafemapap.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/setupewabezavufibesimos.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/95761094057.pdfIn PDF document text
    • https://kattliv.com/kattliv/admin/userfiles/file/14528891434.pdfIn PDF document text
    • http://secoinblock.com/upload/files/71789900763.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72507418602.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/85967924132.pdfIn PDF document text
    • http://hangquangauto.com/files/11075031500.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/65796930398.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16136c9514cb59---puzuvawodidurimumaripat.pdfIn PDF document text
    • https://airbays.com/userfiles/file/35034247112.pdfIn PDF document text
    • http://npas.ru/pic/file/foposolukulitepojurizu.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/59508249218.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613d87f2afb34---54612752481.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/karizevobi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=taj+mahal+songs+free+download+mp4PDF 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_off0000c516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC516 17860 bytes
SHA-256: 72e69811bbe101b4fe46d2df1f3ccfd5480261be67c2bd7514aa8c496f050a89
font_01_sfnt_off0000f372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF372 11012 bytes
SHA-256: bac041722db73579fc0aebc281022aa0144b47267eb69fe0c9fe5007728b166f
font_02_sfnt_off00010cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1