Malicious PDF — malware analysis report

Static analysis result for SHA-256 8519ea3970bfe2e5…

MALICIOUS

PDF

76.4 KB Created: 2021-09-01 07:07:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3ea86f97bc4421fd755b7a628f6f0484 SHA-1: c315dd6e2f3b35566db625d22983f9cb3cf087e9 SHA-256: 8519ea3970bfe2e50508299701df46007446877d9ee9fef285db021ef70b9445
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous URLs, many of which are hosted on compromised CMS upload storage, suggesting an attempt to distribute malicious content or conduct phishing. The presence of multiple external URIs and a link farm structure indicates a likely intent to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://perfecthospitals.org/FCKeditor/file/kowuta.pdf In PDF document text
    • https://groupunsur3.com/contents//files/67364892296.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/dikegarup.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/ropibaxupikajak.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941e71ed972---13160978716.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/f367ff8564cbd4221ac08598d2143f2e/24502011741.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/51515247265.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16086bd620e61a---dekidupelamuvekeduw.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/728973b944053f97e24561dd61677485/25369619168.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0310618001627850713.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c2736748e4f---77128369839.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/13059838650.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/89707142747.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/53f0e9c287a6394513a20215da291452/5924995326.pdfIn PDF document text
    • http://70sromans.com/clients/871711/File/wivuzedalisuliwafe.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/cb27f49f46335f6ba48295b8202c1e4b/zupuzobubipolemibunob.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/61954063761.pdfIn PDF document text
    • http://stasta.com/userfiles/file/dosedixodiwivekuvup.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads//files/202108070346309258.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/gabadegisapasewulite.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=ace1+and+ace2PDF 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_off0000c7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A6 17376 bytes
SHA-256: 843156bccc5547c97aadc0bb5551156e7de84f90da38497855aebe1b55949fac
font_01_sfnt_off0000f52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D40 9892 bytes
SHA-256: a224eea7b957a7e5677dbbca559a02ad2ab837a94d7aa9cb5a2a6b582c40ce19

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