Malicious PDF — malware analysis report

Static analysis result for SHA-256 298184b6c79641c5…

MALICIOUS

PDF

63.7 KB Created: 2021-10-02 11:19:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 26116411648230dcd1e7dba5b15f900d SHA-1: 1739fd6cb655a783d352a830b8e797f902b4f6a5 SHA-256: 298184b6c79641c5a88326f62ebfbb1e198231d164f119045650a6abac9aa97b
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript and a significant number of external links. Several heuristics indicate that these links form a link farm, with some hosted on compromised CMS uploads and others on disposable hosting. The embedded JavaScript and the link farm structure suggest an attempt to redirect users to malicious sites, likely for phishing or to download further malware. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6907

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.
  • 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
  • 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://pistant.ru/uplcv?utm_term=stationery+and+supplies PDF link annotation
    • http://w3-japan.com/js/upload/files/73534617257.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/wotip.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/mozasekav.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/82110040988.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/87230692118.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412c31531da---73630845415.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/mujosesikoje.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/xuwibiwerakilogubazifa.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/84882116196.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210916_3632E3B57C7C7AE7.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/wabazi.pdfIn PDF document text
    • http://poorclarescork.ie/images/rebazebadajuxejevoxabibu.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/gariluxomuwevivuvudal.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021090714490735.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/7bd827e81f16c9dca64a29f4cbecd21f/nulubasofilegozositup.pdfIn PDF document text
    • http://centronegozi.com/public/musuwake.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c1466df5b5---28617105477.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/90555272478.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/ferubonenis.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/doregiju.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/petoruvu.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/dozafujud.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/59120858356.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/687321675.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB384 10676 bytes
SHA-256: 9eea2377f39b2e397ce0f18221ece358ef4e2bec149a5d661ca4e60bdd92bc72
font_01_sfnt_off0000cc15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC15 17592 bytes
SHA-256: 36ad802ea5c48e6a65b9341134763ecab816115d11591cd2941e9dc9dfa2211e

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