Malicious PDF — malware analysis report

Static analysis result for SHA-256 1013fff262a93496…

MALICIOUS

PDF

70.9 KB Created: 2021-08-18 05:27:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7720dfa14b9b3d3e33a01a2409ff1bcd SHA-1: 1e603b08c412689914b47abca5920740bd1200ac SHA-256: 1013fff262a934964f656e1adba5adbe517bbd20076cc8fb5a976450a299ab2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs and link farms pointing to potentially compromised WordPress sites suggests a phishing or malware distribution campaign. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the overall structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://crewmak.ru/uplcv?utm_term=how+to+reset+the+cp+plus+dvr+password PDF link annotation
    • http://infinity-pro.ru/userfiles/file/jimavesurunizodaxumevex.pdfIn PDF document text
    • http://1000projects.ru/upload_picture/file/wilewufaz.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/90022093651.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/23609806403.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210725000129.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/tavazefugugularesozizisas.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f17477ea4f---99692876158.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/tedofaposu.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e55fa87995---41202503702.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcafc34699---pevunabojaxa.pdfIn PDF document text
    • http://bhs1966maui.com/clients/64750/File/56175869487.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/seposaroga.pdfIn PDF document text
    • http://xigmatek.com/upload/files/13825792444.pdfIn PDF document text
    • http://samtekelektrik.com/files/navabimexu.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9bc59e324---sakunebewe.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/rigipanigazufexa.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55924178609.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b95b21ad4---xoliwubevufelunuzutenow.pdfIn PDF document text
    • https://advik.net/userfiles/file/teropi.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd9dbada40---gowafopuvuvej.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/c1caf7916a98801bf3f62d817e569085/medosejedaxugu.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606edbc2ad345---98067333062.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/tison.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/duzomox.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608826c282fc8---68380598672.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_off0000b7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDD 10656 bytes
SHA-256: 0f05c24ce84608d6d2300a76aceaa3774c214adc45ea5f3a59b9e241791c6036
font_02_sfnt_off0000e882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE882 14884 bytes
SHA-256: 0a3bf1bc35deeefb8f8a9d087f7d2a5d17ff31158bd60048eee0ee81536385d5

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