Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2c4caa08d37bd07…

MALICIOUS

PDF

84.8 KB Created: 2021-07-24 13:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 345836b446cdad010cf04b7bd465bd51 SHA-1: a96be65d7719f4c0e6558d00e9cc3124395fbf79 SHA-256: d2c4caa08d37bd07fe9a81eeaca854cde3db57a658665f36adc0477229225535
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, hosting numerous URLs that point to other PDF files, many of which are on compromised WordPress sites. The primary purpose appears to be redirecting users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://gemwares.com/userfiles/file/burigatolupajila.pdf In PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cc125851f9e---89928111425.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad95d9bba40---jisafi.pdfIn PDF document text
    • http://hrudolf.com/userfiles/53121619299.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/58047076262.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/afc66774d90302fb8b3323cc6178c11c/melisalatobako.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/71118685796.pdfIn PDF document text
    • http://www.empresshasnoclothes.com/siteuploads/editorimg/file/48058871509.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6166a3346---84058710434.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe06aca031---79023936410.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/47cc5163aaa3904ecc629bd79cf58a3d/85771615192.pdfIn PDF document text
    • https://clubsportedinburgh.org/userfiles/files/lupokudedexaxulaxi.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/bojuxiwotonunuwumu.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/lajiw.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/kogasiradozadowob.pdfIn PDF document text
    • https://people11people.com/uploads/File/jenumubirafemusadekefe.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/rd4v5u3bun07qk1eo66dsg94f5/kazovi.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160da675e59378---kopabujopekafab.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/lapavufiduvan.pdfIn PDF document text
    • http://www.grifin.sk/files/pobobesugelet.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e23e37b4a---14425800461.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210721231821.pdfIn PDF document text
    • http://thecrayfamily.com/clients/36408/File/maxivufododagedi.pdfIn PDF document text
    • http://omg50yrs.com/clients/6/6d/6dc66c997efb3e4e8ce6e6e7d0694e91/File/tesunurijuvej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=horoscopo+de+la+semana+leoPDF 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_off0000e76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF84 10476 bytes
SHA-256: a98a367971f00c4556af408133b5a5e6446ecdf6d874f1c4b89bf196171560d0
font_02_sfnt_off0001173e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173E 17648 bytes
SHA-256: 141348681038c6d5a92672c54ddd8172da341618fc77541e6311cb4b1b0f97fd

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