Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c16d90ef5a6fac1…

MALICIOUS

PDF

83.8 KB Created: 2021-08-12 19:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c06250071ab9403b0d5fff237b5521c9 SHA-1: 81a48a1b83da9e272f3e895e2766ef38691b542a SHA-256: 3c16d90ef5a6fac134c6714d557eec2c118ad0d499bb98dc416f50f8b1116ad9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the URLs and the 'link farm' heuristics point towards a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://allytemp.ru/uplcv?utm_term=problemas+resueltos+de+suma+de+vectores+por+el+metodo+analitico PDF link annotation
    • http://goldia.cz/data/file/5498410256.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/7949b8e5acae6e190f86eb39ed442d7b/kabefidasawi.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/84941568603.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/66467439697.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/2783b6ee1739dd7c09f9b897ed7f2d5e/pilofojenonijelaru.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfec6356f0d---84548327684.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/pubujivufavuvamizuzetazux.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16113648b45f8f---xaxedamopon.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/f9f1f2cd40d0994261a067436536a92b/76565950432.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210530170316.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/30485882717.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/98332229410.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/zivijejirunebakiganoni.pdfIn PDF document text
    • http://bociany.sk/media/file/26086224134.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/lakinuzofapedenilu.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/furivul.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b40766b95---mujixur.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/nokinujimalurubeworogajop.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81734173963.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/zonetonefam.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/tawofagimevila.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_off0000df3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3F 18652 bytes
SHA-256: 55ec830aafd7619b9f7660aec753f39330e289f98c27c2d9414828231424075a
font_01_sfnt_off00010fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD4 10980 bytes
SHA-256: 3fc94e524291a13c340df9c323c2cd30a00f77310dc856d73d800ec80f539a53
font_02_sfnt_off00012919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12919 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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