Malicious PDF — malware analysis report

Static analysis result for SHA-256 30e4ee8d98f6f657…

MALICIOUS

PDF

95.4 KB Created: 2021-09-13 21:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bb738df4334f555786bc3f9a645fcfad SHA-1: 170caa219982f0def66ce31e03d3344fbbef8bec SHA-256: 30e4ee8d98f6f657adaa0b74dd4a89051e228da5d35e37558d760f885b7b52bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or SEO abuse. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://ratchadatitan.com/UserFiles/File/99978348714.pdf In PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0aaff317d---jawojuxogotape.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/61065051016.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161361620b969c---lenabuvo.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/85283624993.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133f56e35850---48905421960.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/85735698311.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/41675445249.pdfIn PDF document text
    • http://imoroz.by/upload/file/20497640408.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/26166333439.pdfIn PDF document text
    • https://loyd.rs/images/file/24905473207.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/45900955044.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/15083854370.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16137671298dd5---zurofotekuzux.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/fewanoruvabonojix.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/5625378027.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/sokibagugudonunadaluto.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/joleniluvevezi.pdfIn PDF document text
    • http://101balkon.ru/upload/files/96370462560.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/vamewaxizalusovuxunevobif.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/18858268969.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/wazow.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/41883201412.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090320454732.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/fokavokig.pdfIn PDF document text
    • http://fsanaq.com/upload/file/2109110204312422523b3tr3nozda6.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/lukik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=get+free+instagram+followers+onlinePDF 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_off00010f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000127b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B4 10684 bytes
SHA-256: 32a249476280211266a82174d5ea02e433d858600f52da5c973f95be938e252d
font_02_sfnt_off00014043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14043 18416 bytes
SHA-256: 796614d6a1f832d18bfc67fd503521baff1949a81b6958e08298cb35d447a875

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