Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cea4db14cdd67ae…

MALICIOUS

PDF

70.9 KB Created: 2021-09-06 23:27:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: acc8520b2c5ff865b6eee15d7540fd3a SHA-1: d9e868dd8341b793639a1a3249c9c03b0ec5d16d SHA-256: 8cea4db14cdd67aef539b2a4e00f565ea1de0fb2c627101e4f33c54051c392c9
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress sites, likely intended to redirect users to malicious content or phishing pages. The presence of multiple links on disposable hosting and the use of compromised CMS upload storage further indicate a malicious intent to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7830a33ff---dazifemujemewep.pdf In PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/54329523473.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/8f07ab6f150904e766ffcaf9b21da30e/jiwalovaguwezuwukeluk.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/89734996699.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfda5841e9---milozuruduforeposofiwoda.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/32734629374.pdfIn PDF document text
    • http://lapempi.nl/ckfinder/userfiles/files/rukabajunitubenabopaxusip.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/25345476513.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/17979760964.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/5e2cc53e0c69d343957f436793363411/wexedowafupaninuro.pdfIn PDF document text
    • http://www.hcc-cpas.com/siteuploads/editorimg/file/kisutanukowufudalikel.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a108c5904fb---46492087664.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/firal.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115283504ce0---negomere.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812babc2ebb---86200874831.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc26abfbc0---wobasinajujonaxet.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f165e7e5e---jumetejisaj.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/l2b0qji3orng8aulefqu5v7tc7/tomafoj.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcdc3cc12b---fidixubadijazokukexu.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210603221122.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/31778663807.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/58768596768.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612e7a742b1a3---99780785905.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/64978202185.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=vocational+and+technical+education+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_off0000b7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEF 14956 bytes
SHA-256: 538942ebe050b568fd2203780b62142605dbef4a629c5496e822cfbfd04c7f4f
font_02_sfnt_off0000f58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58B 10520 bytes
SHA-256: eaaff1804b667816d66f6e891cddb7530001a4f4e99dace892de59fa39c0cb67

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