Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f90530a11c3c808…

MALICIOUS

PDF

77.2 KB Created: 2021-09-12 09:30:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d8bd847bbc58c384524f0369e7aa2f33 SHA-1: 5e23e981d3b4215d7dd812581ad29d6978feaf97 SHA-256: 5f90530a11c3c8082401c6e6ba4e239a97f64f9613aaa69b113cdf7260ad2e4a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to disposable hosting or compromised sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • 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.
  • 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://ckudzcssffhhj.handysociality.com/upload/files/wofukasutazed.pdf In PDF document text
    • http://paulabenveniste.com/UserFiles/file/sonibemudelajeni.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/36594941905.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/namebojafof.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/48173082731.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/ruvajopud.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/wugugidexonobomiwi.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210904053405.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/doporajipova.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/28143269740.pdfIn PDF document text
    • http://malerbetrieb-malanders.de/Webseite/pics/fotos/1/file/jujegosoretuz.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/8a1df8b8dd1c997e120332e85ddebf00/15663609243.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/zixoxokixepubej.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/60709493095.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/91190341068.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/a2d606a21283e6238fa7f9d83edfa41b/97192280298.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/26514729954.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/nuxiremotolasalogibiroro.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/zajedikisamemogufenimiw.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/dapudiguwujobamenore.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fb3319791---vurir.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/rabaxumadasilinurosat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=windows+10+pro+64+bit+1903+iso+downloadPDF 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_off0000c3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3FB 18500 bytes
SHA-256: 59e45a6eb22df8b57e9ebacffea588b3b2963b00b040cf9f85baec7895aa2b42
font_01_sfnt_off0000f46a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C81 11232 bytes
SHA-256: dedd2b382a05bde4d2614e540597f93dbc721334e3f787e6059e886f882cdead

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