Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d890eb59f84e7be…

MALICIOUS

PDF

86.0 KB Created: 2021-09-02 23:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 89133fc745b69b214bcae881811e4f8e SHA-1: 828bffb211038eef68f14bc4632210211e19654a SHA-256: 6d890eb59f84e7be71e1165e86bb93d02ea024d28db184aa06c70ed8efdfab2b
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites, suggesting an attempt to lure users to malicious content. The presence of multiple external URIs and a link farm structure strongly suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/a9cf7085b05b8f637618868f819474db/57206634644.pdf In PDF document text
    • http://cabanagarden.hu/editor_up/45549720368.pdfIn PDF document text
    • http://ithaca1966.com/clients/8/85/85e9e0a76fddb83d7689cebc6ab07fae/File/22324439710.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/tujanudewife.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf450225a2---gatinam.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aecf186330c---xezuguzizejoxo.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/95327137284.pdfIn PDF document text
    • http://agavietnam.com/img/files/mavajosejamajoba.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/xekawomiwavine.pdfIn PDF document text
    • http://graham1978.com/clients/79565/File/bubixukudav.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a245ee9f6c7---34630468827.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f533cb8f98---99962230965.pdfIn PDF document text
    • http://holzbau-napetschnig.at/nuwekofupumizatepobi.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/61155073732.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/4aggd2a1a2lsrjn8r30p8piij2/17413860854.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/0949b77bbeebf0e062bc7cb2b79c3d37/kefafovu.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/a5632aae11541b7da70b3f28cadbf4d3/26061945896.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/toragubuwugaj.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/17800755424.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/492112e47f538340b7bf736661e3e930/43984512646.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021071919331936.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/xowexofulotimedenezelos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=assertiveness+training+cbt+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_off0000eb2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2E 10816 bytes
SHA-256: 3178af70a669f091850997dde48ec95124af28fb3f31675a903f44c1382a116f
font_01_sfnt_off000103e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E4 17888 bytes
SHA-256: 173d469f505ab78e7c9bd2497654ff2d63d25af5364b270f4e721152d035f2b8
font_02_sfnt_off0001322d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1322D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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