Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9a0219214facdb9…

MALICIOUS

PDF

83.7 KB Created: 2021-06-12 23:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 95d7192489a708c14bf60049b11b3dc3 SHA-1: 9a5e66e783bc2d31f881e7f6c2a35cfd7874480e SHA-256: e9a0219214facdb9fed8c1e17891c7ab62f144ad57e9e8ec8fb23ee85acec054
156 Risk Score

Malware Insights

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

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://coretry.ru/uplcv?utm_term=how+to+do+webrip PDF link annotation
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/89a52f79c9b4868d26ce281c6293de05/wizepiwifub.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/zewivupatebetorideloru.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/73700301180.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file/%5C/kijiruwuwibozukixedim.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d35031aff1---51181599943.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/c28h3l8ec6se3542n79eiti7d2/vomapix.pdfIn PDF document text
    • https://bamor.org/userfiles/file/susuvalufubuwiwa.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/zefilurixuve.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607086e4ee180---legizajebixababibeweminim.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608b20469d6ca---43236102513.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/dujatakanapadoga.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ff35d0a87---menojifefivonid.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff0b2dd360---lexuzilepiri.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/46834169079.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160874a8d3dcc8---89651379529.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file/%5C/2021050121273442.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E2 4724 bytes
SHA-256: 8309ca3ab9df33963f65d1a55af2e9db87aa2114e6c1d32c9cec49e0a3dfe12d
font_01_sfnt_off00011205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11205 2060 bytes
SHA-256: f5134455c847df88ce0bb54344bd1ffa7b419b283eac5e7f9f94e961f80fee10
font_02_sfnt_off00011af3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF3 11600 bytes
SHA-256: 9b9d0ac9c293c69f73a3eb77dd1d4dfdaff0c3f74ae7f42f787dbcf9d5d9c20f