Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b2b65e94326c361…

MALICIOUS

PDF

88.0 KB Created: 2021-09-09 07:27:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: c81ff2a1a4294b6b53336d1c2cbd6a5c SHA-1: ad02959bb08afacaef6192e5183d1aa8c3062016 SHA-256: 8b2b65e94326c361833caf370b9657f2f59c4f2f645265eba4752d6e978bcc84
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a lure to install a browser extension or update, and numerous links to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the overall structure and heuristics point to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://triatlonbizuterie.cz/sites/default/files/file/72192848182.pdf In PDF document text
    • https://dunaweb.co/bg_image/files/milunuzeturozixigubaf.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/92905044220.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/75324122676.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210901140941.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/35359506106.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/gezavijadovinudakajexedu.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/55846272349.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613950ecadbee---xawipetoduvu.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137eb85d30c6---16841705667.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/21644245130.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/86433571802.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333a66a4c6c---todejubonezenare.pdfIn PDF document text
    • https://graphicart.ro/fckfiles/file/dufewowekozugorabado.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/4560586343.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/guwomarotiwovomu.pdfIn PDF document text
    • http://inistor.com/ufiles/files/bitikakuduxi.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/18871109950.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/42323906462.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/tojoradobanorapevavapiw.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/betositofumamofav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=brave+torrent+magnetPDF 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_off0000f0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AD 18964 bytes
SHA-256: 6ef246ae48fa2331f80ce002bb1e8f90b5188508719fdabfe0887e330653011f
font_01_sfnt_off00012284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12284 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A9B 10264 bytes
SHA-256: 0db6a45e7df36f5b782cc83e177a936e19ff8501b504f3fa17d1c3fc8f6989b3

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