Malicious PDF — malware analysis report

Static analysis result for SHA-256 86843d3c5f2d7799…

MALICIOUS

PDF

79.9 KB Created: 2021-09-01 20:06:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a046ea39f88af378ac20f146263f184d SHA-1: b2f8944c10b1b45ae7bf447c078e5e4cfb4c1860 SHA-256: 86843d3c5f2d77997f0c0ad261595a9c6e86c1900d16145af73de4f5082dc457
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites using the Formcraft plugin for file uploads. This structure suggests a link farm designed to obscure the ultimate destination and potentially distribute malware or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3622c4b0a---75038044988.pdf In PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611ac35a68b9e---sijivegiwupemefakezagapa.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/4466071056.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/87794758846.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/9cf25525d970173f204a8e3599902ea0/73634836501.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///771233608.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160766018554a7---senufomonura.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/98257240965.pdfIn PDF document text
    • http://abnicum.com/files/file/95688093082.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160738fb44d00b---31291391688.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0310618001627850713.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2201f42fd3---720679990.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a581a0ea233---13671728431.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210707_051819.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160819e26e0d47---dujatiponovexi.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/tupukun.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/48467103696.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/58731260996.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/gerepug.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/5953689888f4866cf6249012030eb9c6/42455082697.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/75409114274.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/25948578902.pdfIn PDF document text
    • http://mrsgladysosei.com/clients/f/fd/fd76c46f75d01f7adbe86f52c2a5b8c1/File/18783825314.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=index+of+carry+on+jatta+2PDF 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_off0000d281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD281 18056 bytes
SHA-256: 409da382b059e0946f88bd029148c4ef2efb5ee362eadab02b4da8746cdab9c3
font_01_sfnt_off00010154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10154 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001196b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196B 10580 bytes
SHA-256: a636c42a23430a7a002d6da75c34ef20ae1a8aa09591156bd2fb9b30fb82ec94

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