Malicious PDF — malware analysis report

Static analysis result for SHA-256 26a2e10f4cbe012d…

MALICIOUS

PDF

75.5 KB Created: 2021-09-18 08:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4d86a44c7b6386c9c056965bcd56ff81 SHA-1: f95a79aec3c874f8ddd06ce1c0a6dcb3d3d2caa8 SHA-256: 26a2e10f4cbe012d7cc24f902c257a98dded7c3609c86e8f306f9d274dad4bbd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many embedded URLs pointing to external sites, some hosted on compromised CMS uploads. The document body is obfuscated, but the presence of numerous external links suggests an attempt to redirect users to potentially malicious content, likely for phishing or malware delivery.

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://norservis.com/files/files/pejageraxinuxe.pdf In PDF document text
    • https://kaptenhoki.com/contents/files/wewikodidorubon.pdfIn PDF document text
    • http://iccjsc.vn/images/uploads/files/27586359558.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/kofubuzomatofezugotodipes.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/fedomakutuwitoz.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/zigenanivijixifafa.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/19bec359b85e316cd4d06ce5de8720d9/64732248749.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/subomixekulu.pdfIn PDF document text
    • http://travelport.pl/userfiles/file/14031069934.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/vexegabafefeletil.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/66199230733.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/99860492796.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/zumamemajeretanopogemo.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/7253450730.pdfIn PDF document text
    • http://shahgrp.com/uploads/jonajazakifirisudifota.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/nizuregafitiro.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/60225237599.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/49602321597.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/juzolira.pdfIn PDF document text
    • http://bcslaw.hu/admin/fck_upload/file/belizobaratodadezi.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137442b25266---88651218415.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130749757056---dutumuda.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/dumuwowujuwidojoduvik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=agario+live+unblockedPDF 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://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_off0000c0a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0A4 18108 bytes
SHA-256: c7724e4e36c99c0fab4634b49ffda0ff4de7e3395cb3cc8a06fe1f62b089940b
font_01_sfnt_off0000f040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF040 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10857 10656 bytes
SHA-256: 1b6e7ef914c97271985892d9377e52d1cd4cadaef044de65dba8010b17a74463