Malicious PDF — malware analysis report

Static analysis result for SHA-256 2869a2babc621bff…

MALICIOUS

PDF

79.3 KB Created: 2021-09-21 03:11:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: acb2607442476b66ee768f2699800b4c SHA-1: 72acc831df48119e9af6b7bd322a13c72d6a4cc1 SHA-256: 2869a2babc621bff55b1562ff6e7a18db27340b9a8f0aff1f89b42ccf5691f1c
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious document used as an initial lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://riversedgefm.com/files/file/gezajinu.pdf In PDF document text
    • http://ukkies.be/userfiles/file/likakabigiwitu.pdfIn PDF document text
    • http://tipiland.net/upload/file/towopopoboz.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/lufipujigudobibarewefat.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210908_B8C630383A502DE6.pdfIn PDF document text
    • https://equimat-cheval.fr/file/21695963446.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613595d7afc84---dagoneb.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/13566037623.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/37938047473.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/zerasemud.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/4be909f1fdf477df1c75cdbd048904b4/71141529710.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/7420307788.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mafulexotijawalogu.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4668b1e04---kigejutor.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/natora.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/monofuzorumurafusot.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/29254689893.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/76354519270.pdfIn PDF document text
    • https://eclearusa.com/images/file/5527030764.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/zigepolimawanikuwojagexe.pdfIn PDF document text
    • http://otohyundaidanang.com/uploads/image/files/77818787669.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/tibaluvoxifawunutugod.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/5102249329.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=mi+drop+apkPDF 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_off0000cd58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD58 9924 bytes
SHA-256: ce9d67e688c4f0b2ff64a7442d17fbeb36690e7ebc55339b12718bc235e99ea3
font_01_sfnt_off0000e347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE347 20136 bytes
SHA-256: 3c104d09b57481d986f0b81b7ecb7bf499cf5f11e1bfcb29c7bdd3011f55199e
font_02_sfnt_off000117a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1