Malicious PDF — malware analysis report

Static analysis result for SHA-256 223e49d431590d9e…

MALICIOUS

PDF

81.5 KB Created: 2021-09-18 23:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 617f977b0e426ba19e954a1efad2bed0 SHA-1: 4f181c7f55299d752d384517b4877434428ed626 SHA-256: 223e49d431590d9eb25297dd1311d9b643583baa41e61a344e7c245f0b80716d
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous PDF files hosted on various websites, some of which appear to be compromised. The presence of a 'download button' heuristic suggests a lure to trick users into downloading further malicious content. While no scripts were directly extracted, the nature of the link farm and the ML/ClamAV detections indicate an attempt to deliver a payload, likely via a malicious document or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://proxima-design.cz/files/file/fatixaxokomawigib.pdf In PDF document text
    • https://arte-salon.ru/upload_picture/wajokovotokutedefot.pdfIn PDF document text
    • http://gibisch.org/files/files/35949297339.pdfIn PDF document text
    • http://ideal-site.ru/userfiles/file/zajufot.pdfIn PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/nuvewozuro.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/11054926717.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/67533830012.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/bumapilup.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/zadovokefosezupinamube.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/1c30169415d209bac3fa5f95d41a398f/31416440707.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141638fc2927---72848322884.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/tiwop.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16140c2ee20470---17649881283.pdfIn PDF document text
    • https://tepihtrava.rs/files/donaga.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/dirisepivotalajofudu.pdfIn PDF document text
    • http://www.icf-plant.com/files/file/20679892033.pdfIn PDF document text
    • https://proia.bg/userfiles/file/guwojozusotizagetafufuxe.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/nexofigufuwafezu.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/61672746446.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/dowipewad.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/fuvivududakadekukefo.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/bokutorufitole.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=i+hate+luv+storys+full+movie+download+720p+blurayPDF 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_off0000d894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD894 17140 bytes
SHA-256: 0c95df6d50a18e57232f8ad0b31a25f9d9603166cd8c699e6ec2b86f2475cb57
font_01_sfnt_off000104f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F6 11512 bytes
SHA-256: 64aa4bf4beda9c8c195f77f24af3a1e4eff719be3d763b2ebcfb120379cd6b6b
font_02_sfnt_off00011ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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