Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5cbcba26e278ce4…

MALICIOUS

PDF

74.1 KB Created: 2021-09-03 17:23:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e2b38a8b8eac93ddc6391c65cf93c80d SHA-1: 203a94f17dd0e21f1ff26318b7754910925e7c07 SHA-256: e5cbcba26e278ce4eacdddef29a1585b31ee2c3c0ebc5c36ece501da3b8c3183
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or malware distribution attempt. The document functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely serving as a distribution point for malicious content. The presence of multiple compromised CMS upload links suggests a coordinated effort to host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/5cbc44a969d0f3500f0bf359b6a8cbb2/didibanilogo.pdf In PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/4b8pj37o23r6vuogfm64ma3n20/bujemuruxet.pdfIn PDF document text
    • http://gospelinamerica.com/clients/874377/File/daregom.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa549349f7d---jevij.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/1f589cd1211b773ab331aaf105872800/lonaxitovadisak.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/70939121957.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/5404247816.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/xarudulobuwew.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/2ce9603bc59d125aeceb776d0875f621/mizozivufebakupevevaz.pdfIn PDF document text
    • http://fxlcd.com/upload/file/88028786826.pdfIn PDF document text
    • http://aiken7050.com/clients/5/51/510ae66c864a6d23552e02d1b5190e2c/File/66317229386.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/panupasisebebosesakasexi.pdfIn PDF document text
    • https://endobible.com/userfiles/file/wufipuk.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2665d91c9---dipojanikipafuzuluwum.pdfIn PDF document text
    • http://1960ihs.com/clients/e/e0/e0b58928a48036c9af8d6cfc9cffdd99/File/18145936922.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/92677153316.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16079cb6c334cf---luwabomumimalozev.pdfIn PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/98419987209.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160e307cd65bfd---dutizifukinanazixari.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a819b5a95dd---tajalixudijesifitosiw.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/277559808.pdfIn PDF document text
    • https://camelcarpet.org/d/files/nogerumidipipovogo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=belling+oven+manual+downloadPDF 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_off0000be99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE99 17320 bytes
SHA-256: 38dfcedbd4c2a781211068e30b8e2174119a87b85ad9fd40367bc2063a49a6f7
font_01_sfnt_off0000ebc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DB 10528 bytes
SHA-256: f43817179d44279e10f3837e8539eb3f406fa5eca27d1bc5d06a5039181bba5e

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