Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef5a9bb93d97d93…

MALICIOUS

PDF

76.5 KB Created: 2021-06-12 16:14:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 202112369dd6edd3bd1287dd1fe9daa3 SHA-1: b566683b6a3869e606e5c1caa2241c976d34d365 SHA-256: 4ef5a9bb93d97d937ff216062a1962d67579a089a5a1b759d1e9f3c3f7dff1f4
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-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://coretry.ru/uplcv?utm_term=sad+status+video+download+mp4 PDF link annotation
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/aba4da230332517b8fe66ac01715a16e/rusuporivu.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/bavezatoxusinigidifevipe.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af7ffb3c34---mobogiwavoxazotolelulen.pdfIn PDF document text
    • http://beateromer.com/bilder/file/xivinuravizidiposet.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2a719a34b---xubusomuxaxub.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/49558030369.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/fikevefeguziwomipezatit.pdfIn PDF document text
    • https://oklasik.com/ckfinder/userfiles/files/nakafisakonu.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/roziketaxoxajexede.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/51174495076.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8508844ad---dizisijafedomibidimozufe.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/bunonu.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091443476071---23252818549.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/gebegeguw.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c348d38d6---zezujumoxen.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b69248390---jonabewafirejurawuxizilun.pdfIn PDF document text
    • http://boxethai38.comupload/file/69529105839.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED55 5352 bytes
SHA-256: ed9b080ba4f648d88295f1814363e22c7e2bf796ca5e48564dc51951d758aefb
font_01_sfnt_off0000ff97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF97 11004 bytes
SHA-256: 671b8a9ace92979140d3d1d8e3640cd9d1ba65917fae803a64c2635b1823f662

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