Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e8fe53412acc1e3…

MALICIOUS

PDF

79.7 KB Created: 2021-09-16 10:19:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cbbbbe434522890c328584dca44a77ed SHA-1: 4d079036c45eaab844a7c8fa229b96ecd743af3f SHA-256: 0e8fe53412acc1e3bcff0bbb7e4fb8d1d29a96d856133ceee774b58f212f46f0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document attempts to trick the user into installing a browser extension or update. Numerous URLs were extracted, many pointing to link farms on potentially compromised or disposable hosting, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://archism.ru/uplcv?utm_term=best+document+viewer+for+android PDF link annotation
    • http://www.focitabor.hu/userfiles/file/10785203253.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/59444963895.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/69542234905.pdfIn PDF document text
    • http://peoplefoster.com/pliki/fitotino.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/sewuzeri.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210916023002.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/89457196784.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/24706430456.pdfIn PDF document text
    • https://tekartltd.com/upload/files/49857556144.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/38630111208.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/66817951295.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340970cc24a---rulowabezirotujas.pdfIn PDF document text
    • https://eagle-aviation.com/userfiles/files/vinig.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/15010723080.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/61680532358.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/xiwavunukukop.pdfIn PDF document text
    • https://galaxy-training.com/userfiles/file/xaribepobofamovibopulilag.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/0f3d37817da7a18661cb0846cf24b619/91452275303.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/ruzunivemovovak.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364cf965e64---70058883014.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/48680430551.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/80767748442.pdfIn PDF document text
    • https://sabresources.com/FCKuploads/file/87555439279.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090506440671.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_off0000d26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26D 10896 bytes
SHA-256: 335d56331af700614ad9dd3cb1accfc86b17ef9868d9ec939a49f5707401049e
font_01_sfnt_off0000ebc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D4 17692 bytes
SHA-256: 197718ccb075739952bd96512ca076fff9c32907775d8b09c71b23d9fb0b38d7

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