Malicious PDF — malware analysis report

Static analysis result for SHA-256 34623a3b02e6b34d…

MALICIOUS

PDF

72.8 KB Created: 2021-06-24 21:29:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 8cd1b8ab9d2023d39000ff5ee25eb2b5 SHA-1: b05562a2017a3f45a2c213a1e2fe193287893a78 SHA-256: 34623a3b02e6b34d8644e44f3d6619324d041fcfa63c04390cef157a41abf49e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document contains embedded JavaScript, which is often used to download and execute additional malicious payloads. The document also functions as a link farm, directing users to multiple URLs hosted on compromised WordPress sites and disposable domains, increasing the likelihood of a successful phishing or malware delivery attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://npxbyy.com/wang3_3_10_27/Upload/Upload/file/202161672152661.pdf In PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ede722b0bb---tugupeta.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/40274928297.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/29695585916.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/sijugade.pdfIn PDF document text
    • http://coffee33.ru/archive/file/17910878385.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/wonetefiwisilosijil.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/pemaka.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1405466c03---13498642029.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/diguvazopidijedinixogilo.pdfIn PDF document text
    • https://argumentua.com/i/file/zumilizawudepaneresesaj.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/pefimugiboloza.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d398c2bffb6---duwawoxedijenewarajotad.pdfIn PDF document text
    • http://1984wnhs.com/clients/2/25/250e0aaa51dad033202e6c34d8602b4d/File/lematuxisos.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbac237469---vivekakolizemakiw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=the+complete+brain+exercise+book+pdfPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAA 5616 bytes
SHA-256: 1e92823abe1c043806996fca0f991869baf2ddbaa5348f10c2cabf54c33ee949
font_01_sfnt_off0000f092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF092 10568 bytes
SHA-256: e365ad2d966c36646203fe28da2a5f3e3d75e8a22fcd9b8aec3d635640669560

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