Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff3d8df455d2525f…

MALICIOUS

PDF

69.6 KB Created: 2021-09-04 16:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b99a635ef2b6650f1aeb94524405ac46 SHA-1: 9d02dc14d503f0cd74a1d804331345ac8562b0e2 SHA-256: ff3d8df455d2525f27c922ffe4077add9acecf0eafa3a92927861ff8f9a0fddf
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the overall structure and URL analysis point to a malicious distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://decoveinvestment.com/userfiles/file/1002609501.pdf In PDF document text
    • http://egyptlance.com/userfiles/file/jomabadasak.pdfIn PDF document text
    • http://jsdarvin.com/files/kituwijevividusa.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021061905571448.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/79726663721.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/4294220235.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/jemogigar.pdfIn PDF document text
    • https://rajatotogroup2.com/contents//files/52002323015.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/75f7148369a8160319a5d9026184cf12/20798432137.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/xisefevobetogano.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///21920763159.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/16917882454.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160dac46f56e93---nigevoga.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/22278222480.pdfIn PDF document text
    • http://gawhs80.com/clients/873705/File/90349903253.pdfIn PDF document text
    • https://performanshost.com/calisma2/files/uploads/nidafimav.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/jarefonolefakomexetir.pdfIn PDF document text
    • https://hagepoorter.be/files/files/11726603239.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb79500107---61519948191.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/84d7880c292d28bc1e8cfb4ee042c8c9/sefigubesufajomumub.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/nesireritan.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/99109364215.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/38317992359.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca3e74fc4f---vajemuwajavofipe.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/c3117d9ae38772796582a39860a65e55/mofas.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/78b8d65a95ec08e98b5989553b5e79e7/60671008817.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=tremix+flooring+procedure+pdfPDF link annotation
    • 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_off0000b486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB486 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC98 14388 bytes
SHA-256: c79e65e16b8989e68ec1938641bc7c804b2d75a7af9008e0ebad4f43f0fe02d8
font_02_sfnt_off0000f078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF078 10700 bytes
SHA-256: 77e592267616f28c9ecf83148fd3c9ac36ef2532fda71698d022237cd26184ce

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