Malicious PDF — malware analysis report

Static analysis result for SHA-256 383c29028520684d…

MALICIOUS

PDF

86.9 KB Created: 2021-08-14 16:07:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 856e482adac2307cdb983a8f7419a3f3 SHA-1: 9b94f1b2dc1e4527f615c6de613e03e49f6efbf7 SHA-256: 383c29028520684db9343a13cfacce1aad3c73d9153e4954a64ad6b79c9e2655
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate this document is likely part of a phishing campaign or malware distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://krisoc.ru/uplcv?utm_term=krrish+3+mp3+songs+free+download PDF link annotation
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/b02dcefb5f623dd3844d69fbe3f5b8ac/79310843884.pdfIn PDF document text
    • https://cvzona.lt/resources/img/files/vokajilipitir.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fejerelev.pdfIn PDF document text
    • https://actor-conseil.com/files/file/maxuzevilebujixufubetiba.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c1380db70cb---rivebefavowupunigopumak.pdfIn PDF document text
    • http://www.asslar.de/downloads/rojotorevonekuviv.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16108aa4092c89---26564175118.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/59823718329.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16080e541c0863---16559657267.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/b8d0f4bfd0a0a1db22ee712631968e9b/81716876270.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/cfcd844cf9c342db3ce7c8a4d6eec196/90370909356.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/16318482529.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/povelikajasovelapazij.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e49558b4f2---reraka.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/kizebiromeruj.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/1ca71b32631af74bb007c2d1f5620479/1409067519.pdfIn PDF document text
    • http://chapelguild.com/images/usr/8075447322.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/cb4a5bc7356c41543cd794f708ed8df1/76390365833.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075dcfa7833f---laxojepa.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/vanigelula.pdfIn PDF document text
    • https://healthcareadvisorsgroup.com/wp-content/plugins/super-forms/uploads/php/files/hqgnq5l035b5jelrmjlhhli036/45177966305.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160780dc34e4bb---57378842236.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/vareme.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7A 16936 bytes
SHA-256: fa35799e375fd4f51187d2fa86f2aca577bfbefe0a2497732ad3a4873842f3f0
font_01_sfnt_off00011bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F1 11096 bytes
SHA-256: 62d985348fa0f77af706b92af63b885565eefb1f3e4c66d9fafc5e2b267c71e6

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