Malicious PDF — malware analysis report

Static analysis result for SHA-256 d22ac538c95bb9fe…

MALICIOUS

PDF

84.7 KB Created: 2021-07-19 05:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b9bf41e5142f45f9aab5f6dfc5b49667 SHA-1: fd2c64403ac5216e4ede807a770033a849d77556 SHA-256: d22ac538c95bb9fed26c5586f39e2f5e9c128a0e60e66619a9d2bcaa4db6b1f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites hosted on disposable domains. The presence of numerous links to compromised WordPress upload storage and form-plugin directories suggests an attempt to obscure the true destination and leverage legitimate-looking infrastructure for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce6d4e2264d---gelukid.pdf In PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/db5a399554833850d30bea084459b8fd/sifuto.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/id4ivkc5fahi5nq428h1pj45s3/68017177186.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16074852d7da2a---93478301189.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/jidesitizoxila.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/4573ccb9519ef06dcdf8627effb272ef/julidomeji.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/pikugimosiroj.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/zaposazak.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/vatijajutujubav.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/22179412905.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021060103430166.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609838c22edde---562701737.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/ganoxebujafisenuleweguv.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/66705637711.pdfIn PDF document text
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/gefijebalexipexuretariza.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/tsj2mkcpgslhv39hev4f0tsn05/mipodoka.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/e168a2cad6495e700ca2c78bb26ce6ce/79110012457.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/6i4brmgbd0vkuf7ga76vs5qk1u/87376074148.pdfIn PDF document text
    • http://tate79.com/clients/868750/File/nenujegalafogodikela.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8f8a88565---79835600864.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/welitazexupevujezukage.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/mabisizurizopezisezipilap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=modified+contour+line+drawingPDF 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_off0000e780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE780 10660 bytes
SHA-256: 4403d1327083a5ee04365a8928a4657fa223fddcb1207400dd6462097818e3fe
font_01_sfnt_off0000ffe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F8 17480 bytes
SHA-256: 7dc096c7b1d5ef916c31645f4b8f6201a8658dedd8eb1f0f3e05a712ccbac14c

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