Malicious PDF — malware analysis report

Static analysis result for SHA-256 503d03277bd98c47…

MALICIOUS

PDF

77.6 KB Created: 2021-09-18 13:14:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3b05fee825ad75479117c16e09c7cee5 SHA-1: 402a668e06638171c3621de631bf1543c79c1636 SHA-256: 503d03277bd98c475d701475c585ccfa0b1dd11e4af372e34320ee51b1c00b9c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://freeware-software-download.de/uploads/editor/file/dofuwazepemezi.pdf In PDF document text
    • https://implantologie-deva.ro/app/webroot/files/userfiles/files/tunufi.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/69590116380.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/01389882cc0a18278c6fddc5c84db9c0/butorelibelovuzafa.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/a1a5528cf054cc26aa36209a98c8ad5f/xidasifaragavakozurojoged.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/notenoruxisuxutiteselaji.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/80225859274.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/1042780fc0e258ffd30e6d58b5a59855/ragafo.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/54960170991.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/nidosena.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134af2e2e0e5---49042074289.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/jadiburinusupofano.pdfIn PDF document text
    • http://jonme.net/ckupload/files/getuvopajerurujup.pdfIn PDF document text
    • https://unaizahic.com/Files/files/88161943630.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d77a8b9f7---30612817341.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/17283282023.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/17960423376.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/lagivobonuzot.pdfIn PDF document text
    • http://eldorautomaticgates.com/UserFiles/file/jibube.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/72100249296.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/75711564288.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/dofevot.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/semotiweginimitiwidinanoj.pdfIn PDF document text
    • http://delve-cr.com/uploads/90174666517.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+connect+phone+to+tv+chromecastPDF 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_off0000cb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE353 10644 bytes
SHA-256: 4335fb581258a03a10f233b75959b8981a49544618a50fcb32419f811f196e38
font_02_sfnt_off0000fb8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8C 17640 bytes
SHA-256: 6dd1775742d027fe36daa450fb80179accfb99d9796aaa72571fe8ac654f89da

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