Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c467b8079ab6fb8…

MALICIOUS

PDF

82.3 KB Created: 2021-08-21 18:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1dd7d5d801941e149997d579471bc3cf SHA-1: da2007bc27f714de345f8e6158e04705534130aa SHA-256: 7c467b8079ab6fb83e6bc73f559f7cccf00e59725c17ed27c7d5ead430afb1ad
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised websites, many of which are hosted on CMS upload storage. These links likely serve to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://kaitosushisb.com/uploads/files/608307000.pdf In PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edda0f5a970---90976345367.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/sanizujurixikapozoti.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/17517090973f203b217ad3fd62bf5728/52090545979.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/80270406713.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/sevozomipevudosetit.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e16d4b5e23---jijisanisepep.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/854071117.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/15088270665.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/kexiwijesudoperobuxapal.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160727ff09affc---18136016489.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/27428655351.pdfIn PDF document text
    • http://nessium.net/userfiles/file/45730632709.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160739d62aa02b---xikasop.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/sufajukalav.pdfIn PDF document text
    • http://www.larucheapain.fr/ljk/file/vepudefaguxu.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a564b619ead---3993126163.pdfIn PDF document text
    • http://splogservice.ru/content/file/nizukejewum.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/4n3caf2druprrupnfpqmkl17m6/xedarokifo.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/32151085546.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/jemogigar.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/43163317424.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b066ab1060c---49276053942.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/b8c4bc50d878e95d7616a9d136c7a3e1/gabujifuwifuve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=vidmate+app+download+installPDF 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_off0000df6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6B 10508 bytes
SHA-256: b603302ac5408bfcebbfd424de47ad9673a0f0a5bf7de1b7a59e2be61ba9d153
font_01_sfnt_off0000f75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6D 17020 bytes
SHA-256: f1a33d61e0681ba8c34ba895de7822dcd4c48f209379e90990fabd0edf421d66

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