Malicious PDF — malware analysis report

Static analysis result for SHA-256 f793e452eaefaebd…

MALICIOUS

PDF

74.7 KB Created: 2021-09-20 02:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ed9c7dca16685847b8b2c80e1e03f016 SHA-1: 5a37c3cdd27186c229e38d7e3d8854ba0be31a82 SHA-256: f793e452eaefaebd3a4600953a6103c1e8034f07fdd5e374df34a119de1488cc
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised websites and link farms, suggesting it's designed to redirect users to malicious content or phishing sites. The PDF structure and URL patterns are consistent with known phishing and malware distribution techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://inwebjor.ru/uplcv?utm_term=android+share+screen+to+tv PDF link annotation
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/63609408997.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/28207839976.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c848c2b953---82667737736.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/78158989063.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/43285609361.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/68916492514.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/fivididuxiwonunezapan.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/23203263767.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/81037207899.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a04b0e6830---xozigaromi.pdfIn PDF document text
    • http://zubrcup.by/files/files/xajajazon.pdfIn PDF document text
    • http://stattus.com/assets/file/69150079762.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/54140249638.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/5cdea8a319b0c685a856f3ff5f9b6d4f/tusunajazumadonit.pdfIn PDF document text
    • https://datenglagi.com/contents/files/xadelokataxebagezaf.pdfIn PDF document text
    • https://nikolsbeauty.com/webroot/f/uploads/file/gapiz.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/5460279949.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/biloxozubil.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/gakujanemuvapedotu.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/forijabusekitanem.pdfIn PDF document text
    • http://benly-carson.com/product/files/jilopa.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/61513784372.pdfIn PDF document text
    • http://glttek.com/userfiles/file/robinopumezodekoz.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_off0000c372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC372 16308 bytes
SHA-256: 956039148e35aa317f2896d5296400edd62c6fb6ab14da51cb0d72f13a8f5bc3
font_01_sfnt_off0000ed5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5E 10468 bytes
SHA-256: f3a08f3d2f80268fcb65dd5ed603f6cbda7dcfd034db7f21b63ee95cdcf47b4b
font_02_sfnt_off00010524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10524 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1