Malicious PDF — malware analysis report

Static analysis result for SHA-256 94cda8f270129d2a…

MALICIOUS

PDF

79.7 KB Created: 2021-09-15 10:29:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e45f015217bb4eca0cd4f64a6ba95f3d SHA-1: 7446d7407ef39178c488d24a11c4cd4a8e224749 SHA-256: 94cda8f270129d2a9b7d39c29365bc12f50400514b55bd778cf77c3f581f7134
164 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it is likely a phishing or trojan delivery mechanism. The presence of external URIs and a link farm on compromised WordPress sites suggests an attempt to redirect users to malicious content or download a second-stage payload. The heuristic 'SE_DOWNLOAD_BUTTON' further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=mbox+android+tv+box+update PDF link annotation
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614139bb30261---16362536628.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/88493447848.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/gevasigonobo.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///zepiga.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/nuxel.pdfIn PDF document text
    • http://htcable.cn/d/files/40045764675.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161415ec7b02d9---nikunebuxotasigifekiwozil.pdfIn PDF document text
    • http://sperrincaravans.com/images/file/18709281603.pdfIn PDF document text
    • http://1careglobal.com/upload/files/16796642701.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/68451279509.pdfIn PDF document text
    • http://ipai-bg.eu/img/file/rijozubekajonelosilijixaj.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/61360826314.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613727f14f350---jetasigusex.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/ce6c0ea58b01e178b1821281ea3f2bed/66416068113.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/notopinutiza.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/0b10a827872fc0ae991196166f0e2b3c/4722470585.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/zizebirukodenuwizopipenud.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/86793530570.pdfIn PDF document text
    • http://allineers.netlovestories.com/upload/files/45888412769.pdfIn PDF document text
    • https://eclearusa.com/images/file/xonesanunufikopaku.pdfIn PDF document text
    • http://grafitym.kz/files/file/mokegu.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/bakamoragolisugi.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F8 10572 bytes
SHA-256: 68ab07ff596b465816dac40f182105928779a0142af751f794680a7d6de0737a
font_02_sfnt_off00010107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10107 18396 bytes
SHA-256: efc2339f8b51e07fc5f7a4b83c70631250efd88ebfa4a6b9d21fcb1bc5e3cbe9

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