Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cb1237af34e2867…

MALICIOUS

PDF

86.9 KB Created: 2021-08-06 04:17:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 06435192133002c4a43591b20b9a1cde SHA-1: 8ace6fd08f24862331fdcde616f1ed989bba728a SHA-256: 4cb1237af34e28678c0e5fb5ae5e88b3b4e410737a2d0a8003b2eb1365bae318
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to external sites, many of which are hosted on compromised CMS uploads or disposable domains. The primary purpose appears to be directing users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nomylo.ru/uplcv?utm_term=final+fantasy+ultimania+archive+volume+2 PDF link annotation
    • http://4998horo.gmmwireless.com/contents/files/40210765927.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/zofurisonofedubu.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/39680086882.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8069275d2---tasexakobivukerad.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/42502721972.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/82920648925.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d235b91ee5b---devusakukaz.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b9fbfd7e541---kisarewilaretadejolape.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/83258980355.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/013959d46970749a57c00eb79fe13dad/48847136538.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6c472d1bc---ludunubimifanixalival.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1321a2161---wigurugiwot.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/51316605472.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/9b750c0d0a5033bcc0f7afb609f9c795/56639742331.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/23625471929.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/12126091525.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/kanipafus.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/sujaneji.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/zexajikakupozeme.pdfIn PDF document text
    • https://giustofiori.it/file/tixadumujamuregu.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecf726fffb---14247757516.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609722c4a3d99---87592895620.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089a4c759980---87715778945.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acf13421c5a---lavukisuborovikelapi.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_off0000efea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEA 16880 bytes
SHA-256: d893eedf2bc3f0a05b9466152d21a41f24cc51b6024f3cdab2a9794ca195a9c8
font_01_sfnt_off00011c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C44 10980 bytes
SHA-256: 67c6ec2c4a3e8fc66697443b12af7984eb0ee3ec5d37dd66bee567985fbbc75d
font_02_sfnt_off000135a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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