Malicious PDF — malware analysis report

Static analysis result for SHA-256 3984e747cd813a0f…

MALICIOUS

PDF

96.0 KB Created: 2021-08-12 09:35:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b01e023ee361affde3d430579545b726 SHA-1: 0c460e8ad450bf6615e292f09cd7d860cead45a7 SHA-256: 3984e747cd813a0fb61f1a7f4a207cb829d46ee0ddb79aed0c529ce4fc9d4146
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, likely serving as a lure for phishing or malware downloads. The presence of external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://laborke.ru/uplcv?utm_term=descargar+gta+san+andreas+para+pc+mega+full+espa%C3%B1ol PDF link annotation
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/6421c858a5b07b6fd7cd6c41cdaa36a1/21431894318.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/b6da45ae7v459jk5bjoqrllgdl/14532158402.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610a048f3eebb---63737277127.pdfIn PDF document text
    • http://boissee.fr/userfiles/file/36020902543.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/gakutazakezavuzodal.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/bomizujipisexorub.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/64d25098cca95c7449e0d5173498e0a0/51537839379.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a04e7828a9c---49675576376.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/83835233421.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/tanuponidaluredujupeb.pdfIn PDF document text
    • http://irishheritagesociety.net/clients/7/7f/7f3653e4c5d791bf76f28d2bf9929747/File/82208725427.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/dewolulu.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/jawutuzasiwise.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609829b813fe9---72808942627.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/1589370102.pdfIn PDF document text
    • http://npas.ru/pic/file/32957698886.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/2673230eb1f8d966019874e935ea9c06/48159512374.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a59ac50b92---teviji.pdfIn PDF document text
    • https://serka.com/serka/upload/files/texipuduxumedugigusojake.pdfIn PDF document text
    • https://mmszke.hu/files/file/23644383165.pdfIn PDF document text
    • https://ultralloy.net/upload/files/25617848960.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/8bddc2e7ee8a4a6cb21d4e6124ba6569/45560908402.pdfIn PDF document text
    • https://csodamalom.hu/files/files/lakasunoselogukavofanune.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_off0001033c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033C 18520 bytes
SHA-256: d90abf2fa4e9aebe68e7f724755affe31c18b8ea1e0bbd1a40f01d96db5ad760
font_01_sfnt_off00013321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13321 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014b38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B38 11176 bytes
SHA-256: 7c5d2070cfd459d6679d01f43fb058f3d208d69c76a169e0338c2d17acb5fb69
font_03_sfnt_off000164f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164F1 1952 bytes
SHA-256: 47b3c42150b77a9b63b02fefd0d29d662123308405488c5ea617aa1ed6bbbf7f

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