Malicious PDF — malware analysis report

Static analysis result for SHA-256 5658b2fa0764f193…

MALICIOUS

PDF

98.6 KB Created: 2021-07-31 21:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e5f842d4d8c69e1d234576300e2593bc SHA-1: ae98aae59b309587c2cada2d507f1c34a9c7731e SHA-256: 5658b2fa0764f19367e4153bc33adfedbe5875ea7097ea1508576197b8a1fe78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure victims. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://garglob.ru/uplcv?utm_term=how+to+calibrate+the+one+touch+ultra+2 PDF link annotation
    • https://lentes123.com/aym_image/files/nemejemiwolaxe.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/78007247479.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/414ac8230448915126018d9922e04084/75572477682.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/balesimumemixebat.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/tuvedaf.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/waremili.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/2726f8132a8dd738081d8ecc6d8b91f8/29991735399.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1f0374c8e---92598652063.pdfIn PDF document text
    • https://semangkabiji.com/contents//files/numawubofuzovojowakase.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c868307b1d---91257605674.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/buxafiropojonegawemami.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/pefd5t0qlrh6cb5frl1tm15v7e/29827634528.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/duvefedirenozulezelosu.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/51946505240.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/313f175539d20e0bf010758f0fde9cad/riziduvunomewebe.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/ff71655ad7a9008db0eb3261a9d56473/dobifavag.pdfIn PDF document text
    • https://realschoolspirit.com/scauserfiles/files/bugexuzidezepibutamedik.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/6782850867.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160735d0fed64e---rodirinow.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160716d9baa494---denanujawisiwajivu.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///saxibabuk.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_off00011ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000133b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B7 10596 bytes
SHA-256: 8059222858936843695f3fac0c4309b9bfbb0aec79ebc61b9c1e978b9b0258a7
font_02_sfnt_off00014be4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BE4 18196 bytes
SHA-256: 8e5db4de9442458036076abd49cb98d21aff112889fcbb7dbf03ae52e79f95f0

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