Malicious PDF — malware analysis report

Static analysis result for SHA-256 281cdac220c2e9de…

MALICIOUS

PDF

64.0 KB Created: 2021-09-06 07:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9f0a043c5f9dc363d7ac874a3b238249 SHA-1: 439e4a873ec1f4cdeefa76f944d40fb9d223a422 SHA-256: 281cdac220c2e9decb995e6855fb0d9781538dbb6a49a5bc1a4b64583dd43e4d
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely redirects users to external URLs hosted on compromised WordPress sites, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8532

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://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aceff393c2---tuxuvavum.pdf In PDF document text
    • http://zatoodesign.com/userfiles/files/divokejosixepajirof.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a202d054248---33752240211.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b67aaeea93---84480955750.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bfccecd5856---8097361058.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/6685295910.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/mufupegezufisawolo.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/70845724770.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/21201220971.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/fujixagu.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/11921461833.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/5bfe971f369c21fef63c7b29ba13e551/pomafutavedow.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/61621215171.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/3ea5c6821f7ca0cbf6c7aea25d9eb4b9/palinikedalofexa.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/ra9ljbgu3jnugcaa3m991j3v04/ravoletemig.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/40506499704.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-6-22/20210622213800929786.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d54a7b21d6b---vafebiporejobirefaw.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/7krrk448gh1b34ekjp5jk00bb2/60709126897.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/bedujalugopubidofulapi.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/aa8ac3452348bc4060bbf002759570fe/xutazuzafu.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/52770692152.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/70332857773.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/pajori.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/rodebexoxapuduse.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/zuxalojudutuxigexes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=goonies+screenplay+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D5 10668 bytes
SHA-256: ad3d9c4244e8d29a2d29597a14743d07fcb5a6f739859d8c3befd90f54ea4cb2