Malicious PDF — malware analysis report

Static analysis result for SHA-256 611b26a03aafdc42…

MALICIOUS

PDF

90.9 KB Created: 2021-09-13 21:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c0f1d59f4b3b47c070e748f4127b59d9 SHA-1: 1837105bda4ce0652db96f9c1c36df061b76c0dd SHA-256: 611b26a03aafdc42071a5330e2a3a29faf68a932d3229398bfb016facd066cce
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and multiple external URIs, many of which point to link farms hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading a secondary payload. The presence of embedded JavaScript suggests an attempt to exploit PDF vulnerabilities or facilitate further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://paliukenas.lt/i/File/mewugevomikopebizi.pdf In PDF document text
    • http://husplaza.hu/editor_up/dilemadenobusav.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/jolepadijuw.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/vuwunijutujevomap.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/63269825161.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/nugibivenewovasege.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/rijedokafulenubetadi.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/49152984958.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/fuxarebitobivakomofujotuf.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/lurifelituzabeguk.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/jiveg.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/jaxipofuwixawukixiwut.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161357377be65b---batipaduvafub.pdfIn PDF document text
    • https://aaaxxion.info/images/file/95148057866.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f09c7150b---90655675983.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/mopus.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/im04pfo8pkajcp2cva32in5pi3/13596765465.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/224981876.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210911_8A66DE41BDC63AF4.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/56287922484.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/a9c3a87f1e266880d12f63260fa1854b/66509461279.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/82840185076.pdfIn PDF document text
    • http://badgerhillfarm.uk/5169718673.pdfIn PDF document text
    • https://upaspor.com/resimler/files/84506246020.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/puzoximanibivij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=watch+zack+snyder%27s+justice+league+full+movie+freePDF 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_off0000faa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000112b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B3 18668 bytes
SHA-256: 08d89dd0057eb9f6c1755d66286f51e6c01629e1a59eba71f8c25655c9eeec62
font_02_sfnt_off000143cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143CB 11512 bytes
SHA-256: 3df4ef1ce254adf8ac10a7846546216ee15f00a5d51405a231fd2e1a69521e2c

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