Malicious PDF — malware analysis report

Static analysis result for SHA-256 76920904f06c230d…

MALICIOUS

PDF

85.8 KB Created: 2021-08-05 03:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1479ca6cd505aa22ffaa0bc3f20570a2 SHA-1: b602b4beb4819adae599c9c50befa0291c41b136 SHA-256: 76920904f06c230d848c4436c8c42eaf93b41334c3b195f2c03e8f7a5a83a049
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection. It functions as a link farm, directing users to numerous external URLs, many hosted on compromised WordPress sites. The embedded URLs and the nature of the heuristics suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://medvor.ru/uplcv?utm_term=borderlands+2+salvador+op8+build PDF link annotation
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755a4fa8d38---33986484639.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c963bcacd43---33501782930.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/lefuzatolopoxeku.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/pukekaf.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/wixawofuraguzu.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/2559fe7149b54bcc1e100c1d1603ce27/zopoxu.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160983e2da47d2---zaperexonokepefi.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/78770774991.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/15328619756.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b59ba12926f---32580214060.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/duwatifixexemunabu.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/icaq60t7967fdm112a1qu8hhi6/mezedemubudixodekad.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/32200147062.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/aojr56uqg09kbjfgbi8k6tgac7/75434244953.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/84665463656.pdfIn PDF document text
    • http://unsersohn.ch/images/file/16222635120.pdfIn PDF document text
    • http://agama-rc.com/upload/files/kuzakimomukunuzedonaw.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/bajeso.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/gorodobafinira.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160987588948a0---jezokapemo.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9f46ac6c2---55632477577.pdfIn PDF document text
    • https://hse.tw/upload/file/50616903099.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/66070840161.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/rupawabanobodenaxe.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdf30c4d87---rifidukoposegujusomad.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1545bb0616---81989819933.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_off0000eabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CD 16928 bytes
SHA-256: 781f02b7d6ba8e71c3d40f40ad6f9be5bafa22e7bf81fbfa34ba00315bd77449
font_02_sfnt_off00012eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ECA 10976 bytes
SHA-256: 1e507cfc691f106d14eb87fb8952840f95e97591da23663b46e956dd1b66075a

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