Malicious PDF — malware analysis report

Static analysis result for SHA-256 67a7d6763420318f…

MALICIOUS

PDF

126.9 KB Created: 2021-07-24 02:12:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 76fd01a9f5b553cae4c2c282e17e8913 SHA-1: 553155aef85a2e392724058357d735d3442269cb SHA-256: 67a7d6763420318f600decf8d2ca050ec4471651b771bbc75fc8c03eb5134954
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The embedded URLs are designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/51f58f5307dba9bcd1aac30ba9b5c479/nezobirikifuwatomo.pdf In PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160844c00c9035---17697516762.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb3a38b65c3---kepokaxavixivuxawabepuj.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c429f783ff---zukanati.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a01d8b7ff86---55789329983.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16090b33988c68---nupowinekid.pdfIn PDF document text
    • https://tl-systems.hu/files/files/14819307811.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbe425341d---9863455000.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb1bc4aa6e---gupurasabedowekodinawox.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/49940175966.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/04d1b4da11b9c0c2e602e0a3628d375e/vatusadegategomameva.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/3728912138.pdfIn PDF document text
    • https://faprosid.com/file/xozuvop.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/ludalufujewujimapa.pdfIn PDF document text
    • https://ckmusicdesign.nluserfiles/file/27632125528.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/51547179820.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/679a066ef1a9e756fdb423ce014871e5/wigenavupi.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083f3ce91d86---24579227906.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4cce49009---suvexixutedidufel.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/15341331921.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/5482604988.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/hbj18emf8itbkrtjpeo2qqr9r7/fafikudogu.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f9e77b36870---99771085629.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/186e7cbf713f93c49e39b3dc82bbb1b5/80197980402.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=are+autopsy+results+public+record+in+floridaPDF 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_off00018d1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001a534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A534 10948 bytes
SHA-256: 5b3a61819f6f43010f68f8e6a585594196f7af99631c47855d99d52ab2d0380b
font_02_sfnt_off0001be7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE7E 17768 bytes
SHA-256: e13ae13ddf892b39a847fc47cdbf36f2da15b3d838c33463ff2181f23c9a3c73