Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ef31a03a1bd10c3…

MALICIOUS

PDF

87.7 KB Created: 2021-08-28 17:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: aeaf31710d0c41ba4078081e07e8568e SHA-1: a4582d6299f424b148defedaec3280d7f5d643af SHA-256: 5ef31a03a1bd10c3fb0ce89860adb3fd0bbd25c9fa2daa8bbb6ebc29e0222c46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://oniceh.ru/uplcv?utm_term=rhymes+with+do PDF link annotation
    • http://chi-kara.net/userfiles/file/30215993728.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082237607bc1---bijojaberumarosuvegi.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/73664587363.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607afb5f28967---vijojumuromileta.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/digarosik.pdfIn PDF document text
    • http://servmed.net/userfiles/file/55175419235.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f7ae0ae4384---32783474694.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/63012768870.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/9b42889eed2bfcba9d64c3372b965bb3/kowaw.pdfIn PDF document text
    • http://vintageguitar.ru/ckfinder/userfiles/files/55582403498.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/bikogifexe.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/rabifepafirituro.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/defoviniwirefu.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/mibativululavuwulukufolu.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/61c5e73585afb4049624dfff2d2a1564/gakoxuki.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a93f5bbf935---50347842323.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd492f99ad8---89962567875.pdfIn PDF document text
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/jiwowukoxelegikasakabapu.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/db1a3565f5240a6036207f652b0f7dfb/2097924202.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffc8596475---63398549292.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/sojewibolitomamil.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/gezalowiriwipewoxene.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/suxuwijogoj.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/47609010842.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/12968917557.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD914 10344 bytes
SHA-256: aafbe2209cd7c73357a8cfdc81db4293c182007084ac6ec564d588fbd62c99c2
font_01_sfnt_off0000f089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF089 17592 bytes
SHA-256: bc668107ef3a5ce1e76af50b0644748d981ba15fe85e1c9f50ab53305b148055
font_02_sfnt_off00011e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13626 17340 bytes
SHA-256: 3836f837230e3f0bf79d54c6570106d8bb7e980beab1b3b544ab6c4124a807c8

Open this report in the interactive analyzer, or submit your own file for analysis.