Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b6c28b5f4bc1ee2…

MALICIOUS

PDF

86.2 KB Created: 2021-06-27 02:17:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 4789e919dad3d068c5c51c76cec9c81b SHA-1: 2ced834cf25c54c24c02cb941836cb6fd1839eff SHA-256: 5b6c28b5f4bc1ee206a858bf8026c3f0da4eb85d6e556d64fe78bfb99526cc5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://color-gateway.com/userfiles/file/47031363894.pdf In PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/131cc6d1a09c550726efe39ab0963deb/boxetonajebajubibepazune.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/filixonexib.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/vejotofoniwowofavireta.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd140707bb---wilofifupusar.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/05407e7b4f2b10db5ee9934711d54d1a/34764404591.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/26538671579.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/xefodojaxetamaran.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070af3b75304---51157060589.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/28864ddd991559d1c032c55cbcb51f08/vuvemazoredibudumowu.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6212ebfe0e3ce4db8e1695896d95d97a/zelegozaxojonev.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc79ae32c4a---62506678195.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//tazutiporejirurete.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a151170d8bf---87608186289.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/47601617072.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/rupebunazunobenosawow.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/mulujubu.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609c88c10a649---40797651376.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/29dfd6374a032ec91f882ad6f07d1f69/68621724619.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/kazet.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/720fecd40b5b99fb7216b63fb8a4cee5/bevekutomowukujatevazadiz.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082839bcffe4---bogewawedonelibomi.pdfIn PDF document text
    • http://7tec.ru/userfiles/files/vagesugi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=gotham+pro+font+family+free+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_off0000defe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFE 22880 bytes
SHA-256: 3a0d7a9fa4b24a8dc59964377491c667723aa97fa9e3fd58c38707cd6c1417d4
font_01_sfnt_off000118ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AC 10836 bytes
SHA-256: a1913fce907945bf09258e4f5a7d3b4af7725e192c4f07e11c2bdb673a8d19b0
font_02_sfnt_off0001318c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1318C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1