Malicious PDF — malware analysis report

Static analysis result for SHA-256 e507d672cb4729a3…

MALICIOUS

PDF

74.4 KB Created: 2021-09-21 09:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f35a9a4bf3cbba89b20dadfa4f02cc33 SHA-1: d91914c0ce0b9dbfc66aaddb083602ccb77db477 SHA-256: e507d672cb4729a31949bcfde683d9926c2f34ee9843cdc688a685563d8ef5e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be redirecting users to potentially harmful content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://infrive.ru/uplcv?utm_term=analisis+numerico+burden+pdf PDF link annotation
    • http://beastyenergy.com/userfiles/file/tuvegefabanuvalunojimol.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/felejezi.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/56309459787.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210921101228.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea0944ef0d---supete.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/17388547111.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/894u32la2b7pcs1d8tma8e9nsc/90170418462.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/savivukuditom.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210911_FCF78F5074DE9C27.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/xasavikikaru.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/98378937775.pdfIn PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/volokaf.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/xafimiwirurosogi.pdfIn PDF document text
    • http://moretonassets.net/userfiles/49606590406.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/18631734995.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613765d810cca---55439073388.pdfIn PDF document text
    • https://kopari.hu/files/file/risodunitosup.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/bodemamelojalikaxewuva.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/25720068392.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210913000456.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134688e172d9---menozoxeloxugima.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/zuzupugoro.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/88813525673.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/3841854855.pdfIn PDF document text
    • http://a899.net/userfiles/file/wepiderin.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/48873542717.pdfIn PDF document text
    • http://mylodge-naoshima.com/2809798699.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_off0000bef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEF9 10904 bytes
SHA-256: c88b2c0469158b6116952da2260a31aed064298ebda4555dfba96a73460a3a42
font_01_sfnt_off0000d7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EC 16996 bytes
SHA-256: a87baaff7570b0047dd9ff4c1b6519c3992f16a87f85cc1067e4be392a453f68
font_02_sfnt_off000103f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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