Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4db4f6c3e587d0c…

MALICIOUS

PDF

81.5 KB Created: 2021-08-17 05:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4e69d2e0b83ac9c9f224ca9ccffeb43d SHA-1: 64f5c6d8a9bc045828fd564bf6d4f1f851a63da6 SHA-256: b4db4f6c3e587d0c4543625c0acefcc9217429636efb6de30cc9c6c2bf5d1c10
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://medvor.ru/uplcv?utm_term=how+to+make+atlas+stone+tacky PDF link annotation
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/3476366e21a0596af5c37d1e7bb7c856/99631615471.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ec4f9ce09---xajapivipadoxika.pdfIn PDF document text
    • http://tamphuhiep.com/Images_upload/files/jedowewonus.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/79533823753.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/60515592515.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/lalubinupowusoze.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/85268447758.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/1c6bcd919a724ede9e3861527184050d/44545083027.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/0k8n007luqlt8t1qc6fqf5cnu0/zakukit.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c227cb9057c---kurowajarazamem.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/29570970885.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/b9a3d39acd4955dc7d9ed14f0f263d91/71637947149.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/nemoxonefetofopozixemaguf.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/4c0a4a2983f7652c6f57067f8c011da6/83519531192.pdfIn PDF document text
    • http://canvangdientu.com/images/file/mepovipef.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857de2d5f88---27813499753.pdfIn PDF document text
    • https://sanidom.pl/img/file/kosikesa.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/28311559f4b626aadf3ea428ae95575d/miwab.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085a61e20bdd---widodomaxagelevesuxare.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/zajidarivajebabari.pdfIn PDF document text
    • http://flexicourse.cz/res/file/40195099858.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/21274521307.pdfIn PDF document text
    • 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_off0000db86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB86 17052 bytes
SHA-256: 9d11c57c5ed26b63b1057292b023bd7028db066dc69cad1a3795cc4bb8f9e05a
font_01_sfnt_off000107cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE2 10480 bytes
SHA-256: e2b567d5697bd73cdd10edbc03563579c40057f769e7bcb04dd19e5f01c0b9dd

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