Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aed8ed6268e0fa1…

MALICIOUS

PDF

85.3 KB Created: 2021-09-17 21:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dfd0b3a0154e34e0e4d8551e5643675a SHA-1: 89cee5817108d27a9adbed99271da6d23d91cb24 SHA-256: 4aed8ed6268e0fa1c6cb56c6392f033bbcb9196b568f21240c42411b6ef5201b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that exhibits characteristics of malicious activity, including malformed streams and a link farm pointing to potentially compromised websites. The presence of numerous external URIs, many hosted on disposable domains or compromised CMS uploads, suggests an attempt to redirect the user to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to exploit vulnerabilities or trick users into visiting these external links, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/lasexulokadiwakigunizavad.pdf In PDF document text
    • http://cancercareresearch.com/userfiles/file/15973145606.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/161303f0353bb6---govoza.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/losisodutek.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/85283968942.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25440344513.pdfIn PDF document text
    • http://maksimetall.ru/files/69129720879.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/4190aa51a26d70f2946a925dda66db28/lutexex.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/58645789406.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/putolowexigov.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ed263dfc1---rilovi.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161354532ab260---53557883092.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/monila.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/sukametexivomig.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f25045eee---desenezubulivovo.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/47194488379.pdfIn PDF document text
    • http://kondicionery-pushkino.ru/upload_picture/file/971487289.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/wumonizirikegijepemitamus.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/mewekazaxaxokenatogewedo.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/fikeriwupidudusalukivarol.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/11938700181.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/95817636469.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/157ea4159106bf5a16874a5e2ed12c65/19044465720.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+wipe+my+old+android+phonePDF 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_off0000e906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE906 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001011d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011D 10680 bytes
SHA-256: e1a0a5c753d8bb4196551efccb4736e7791a2d8b812c162f5681727a504d5aef
font_02_sfnt_off0001195e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195E 17620 bytes
SHA-256: c82829061c38ea5a2e869e254d83314f288a73cdfc2ac6a7e8308f3a568cbe0e

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