Malicious PDF — malware analysis report

Static analysis result for SHA-256 49eef83c35febfe8…

MALICIOUS

PDF

75.6 KB Created: 2021-09-22 13:57:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a1a59a5c6582b5bca4405766cccb82f5 SHA-1: a78ee74c68835be2efc64df08e3446fc34f4f0a5 SHA-256: 49eef83c35febfe89a31abf09b70502dfeca71667ee57bd9979d21f66cd43f75
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various websites, many of which are hosted on disposable domains or compromised CMS platforms. Heuristics indicate this is a link farm designed to redirect users, with one URL specifically mentioning 'asphalt 9 hacked apk', suggesting a lure for potentially malicious software downloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

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://medvor.ru/uplcv?utm_term=asphalt+9+hacked+apk PDF link annotation
    • http://bckbytow.naszbip.pl/img/upload/files/15316308646.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/22461652388.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a64fba72f0---rolagubuzebafin.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109011552485826.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/dokepanawelamalerepugexe.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/66183848209.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/wijufosadak.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/91593843690.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/dewujaz.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/6476036462.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613910ef32841---nipaxeg.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/74982916478.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/jekimebexepuwe.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/81462657905.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/79091426789.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210918094606590.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/xonul.pdfIn PDF document text
    • http://soc-in.com/data/media/files/83483210735.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/31548060490.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/bediwev.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/zivimujupaxobaxonoviz.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/c2b299dde592c3849b0736710849222e/bikiwa.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/xamut.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_off0000c367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC367 17316 bytes
SHA-256: b76b948f9228deba3e2d21ef78dd44716142ab850a8e4fabab5feb78b297be99
font_01_sfnt_off0000f0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D8 10436 bytes
SHA-256: fb3b9d986393cf52be1a66d6c955b1f2037ce67d86babaacad73ddf10fe68468