Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef4b4ea180f50fc6…

MALICIOUS

PDF

90.4 KB Created: 2021-07-14 03:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 523931b5ec109d78a0fe148d4e3b8507 SHA-1: 18745c9698138aac1932df09753bb8255f19945d SHA-256: ef4b4ea180f50fc69425c418743c67bed987b6391910ba6929b5f870ed8c163f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised CMS upload directories or disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://synerhu.ru/uplcv?utm_term=misplaced+and+dangling+modifiers+worksheet PDF link annotation
    • http://kingcraftviet.com/uploads/ckfinder/files/41769308507.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/99606043939.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/38975ad1222595db588f145f0bcf5873/podufelarudiderasukume.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c70130e549e---25819187050.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/59838154590.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/dariwetebajakekitivi.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/cdf6c7aff8150b704829a49fba7f9492/70803945694.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609825ed38462---tamewesamobabobunowoguj.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/20a7b74c8dc115f20286fb877623949a/99275585201.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/vitevage.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607df0e29ea07---lizomatofeketosurozamanaj.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c8c0b6a74415ea9b2cf8e9047f418994/41918254892.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c6453f7a2---90464588542.pdfIn PDF document text
    • https://lbassicurazioni.it/file/90885637732.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/50850892849.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c136699bde7---71910662045.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/48265090575.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/p3dq32uh2p6uhfe6v1681f6o9l/94611261541.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608111509bdad---zopifagokozetitadalebemef.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160953193b4281---29028043908.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/6eab4d59e1cd2a5c4b40fc484b53e2a5/62446951933.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/366814a0e6443eae5d1cdd11d532f520/futovomawumugafabitox.pdfIn 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://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_off0000fc8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8C 17504 bytes
SHA-256: 8655190484114fa5ad5e31e4e8a88dbda528f228818a1ff1309143188d9ecd65
font_01_sfnt_off00012a4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4D 11236 bytes
SHA-256: 0b2528e19956aec76176776496c8c491e278d65ac39387f01a9f9b36922f5c10
font_02_sfnt_off0001444b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1444B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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