Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4b7230dd9e72ea6…

MALICIOUS

PDF

81.7 KB Created: 2021-09-06 19:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: c5a5f646c76282fabf2cc4b920906a0b SHA-1: 11e4fa97ba517ba6ac6aeb97a4c3f48eb8c051f3 SHA-256: e4b7230dd9e72ea68a67779bd81205b6dcd202c260a56754a3988b448f976f59
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable domains. The ML classifier also strongly indicated maliciousness. The primary purpose appears to be directing users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://southerncross-ex.com/images/blog/file/tidumupuzisosolasolij.pdf In PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/eaca600993e906a8795aa70eeeab9689/gepixajadejobobutax.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/d998f6e5dc63e7e1e055024134693f4d/pibaxotanenekazinineba.pdfIn PDF document text
    • http://17njl.com/userfiles/files/46504509613.pdfIn PDF document text
    • https://metal-et-verre.ch/ckfinder/userfiles/files/tudutumim.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16115c4ce66e5a---tevupupuxa.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160999f61d106d---xafukufekuwopatezizotilek.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/sorobezazejaliluz.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/timuralonogev.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/32265762360.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/xupanamebotabawevarijon.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/5fc804ec07d6b62b9040deba6d9ae5fe/zobijanopagubijepi.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093b1495aa66---kazabam.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/tozadafuwuxiji.pdfIn PDF document text
    • http://samtekelektrik.com/files/42894751538.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/vomuf.pdfIn PDF document text
    • http://packturf.fr/files/nakaxopu.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16118b57d05f21---vegalajilititexakosiju.pdfIn PDF document text
    • https://kham.vn/userfiles/file/benusufefapaliw.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a24c0c5f4f9---63912130969.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/75194487381.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/57866496703.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=quantitative+chemical+analysis+daniel+harris+pdfPDF link annotation
    • 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_off0000d9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A8 11104 bytes
SHA-256: efea43e6f26fee669518d091bf29da2b5aa3895df756807018939ce3231d7bff
font_01_sfnt_off0000f375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF375 17620 bytes
SHA-256: 8e5f496d45c2e06865b4f339c691ac0b1ebca9a5864f89d611627127e363a4c2
font_02_sfnt_off0001211a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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