Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e327e6a57f5db10…

MALICIOUS

PDF

87.7 KB Created: 2021-09-19 23:29:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2b962d19a8cf53521aa8d85b54163ae4 SHA-1: be68fffdcc0e5e80463daa2e2ecff15b97f8f8ee SHA-256: 4e327e6a57f5db10fd8f2878ec4da246f2b3f197d852da00dbec1ef85e862440
196 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document attempts to trick the user into installing a fake browser update or extension. While no scripts were directly extracted, the PDF structure and numerous embedded URLs suggest it is designed to redirect users to potentially malicious sites, likely to download further malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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.
  • 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://aletihad-group.com/userfiles/files/85275184029.pdf In PDF document text
    • https://marsanz.pl/uploads/fck/file/gelusozasopobolosarefitus.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161363cec53b3c---97163065679.pdfIn PDF document text
    • http://ozdermusavirlik.net/userfiles/file/93375396495.pdfIn PDF document text
    • http://apsons.eu/files/file/gazerawubi.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/ff869cc4ae051bfd383a3e02d5db54ea/gimikunaxovinimirediwan.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/72726516905.pdfIn PDF document text
    • http://registermycompany.in/admin/userfiles/file/rutexorudav.pdfIn PDF document text
    • http://dezis.ru/uploads/files/pelogatofisizanoleposim.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/16656838075.pdfIn PDF document text
    • http://holzbau-napetschnig.at/15057388234.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/k3l7j1fhj4oj8mpv3mjv6gosf4/38495319089.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/gadurisadibulomer.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/39092181823.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/85593677001.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a18e02422e---jexozazazumabilifuj.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210908005955.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/jowobabixovexenasudiboxu.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/97128240023.pdfIn PDF document text
    • http://agama-rc.com/upload/files/57293189432.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/89980434510.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/69222034725.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/71679492206.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/18193066720.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+can+i+see+an+unsent+message+on+messengerPDF 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_off0000ef5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5F 18632 bytes
SHA-256: 6268448bbc5161fb2ccfb63a783232619c025ef9e84eb66e30fce92432d787f0
font_01_sfnt_off00012013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12013 10704 bytes
SHA-256: a6d490351bb33dcd2a05a3e3119e81f2f2545101927aa01b2aa50695726019cb
font_02_sfnt_off000138af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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