Malicious PDF — malware analysis report

Static analysis result for SHA-256 4729838f9235f583…

MALICIOUS

PDF

83.3 KB Created: 2021-09-10 08:22:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 28783ab1c4bbc03e8733d83673e55789 SHA-1: 9cc0d6861e8dc615479bae18ba1fbea367121bdc SHA-256: 4729838f9235f583da2ce9041fec6a071bd465615730e16aa97ae2b416e178af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, and the presence of embedded URLs points towards potential exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://garglob.ru/uplcv?utm_term=twilight+struggle+rules+pdf PDF link annotation
    • http://derkwoo.com/upload/editor/files/nadusoxuzoxogip.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/gamamujejanazotunitisiwo.pdfIn PDF document text
    • http://dptour.net/bot/ckfinder/uf/files/lejilekemijubiweduwajid.pdfIn PDF document text
    • https://airbays.com/userfiles/file/valesejome.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/72552190283.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/telizagoloxovati.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/96817357593.pdfIn PDF document text
    • http://matkinhantai.com/luutru/files/60151921623.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/patudikokefipowerel.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/21233780548.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/20295958417.pdfIn PDF document text
    • https://clickbox.ro/images/file/82950994298.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa9219da24---951620385.pdfIn PDF document text
    • http://border-collie.ru/sites/default/files/file/35325933525.pdfIn PDF document text
    • http://hkwwta.org/userfiles/gusuzogobozevoriludokezu.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/kerizuwejozozovoxigokad.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/luzoseganuwuvorotugumur.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/6addafe22ce795450f45af8f78a949f6/xupozuraguwexulebola.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/36940275842.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/tewiribug.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/11540333396.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/gajujopukagunadofuvaf.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a638ce1bb.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/8hu0s57294bkcn8ocnssil3c2n/bafedopugavove.pdfIn PDF document text
    • 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_off0000df68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77A 18384 bytes
SHA-256: bf0bfb17a92b2cc0b3334785c621ecf4f05a1ffa91c16b9649fa622d7424197f
font_02_sfnt_off0001275c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275C 10540 bytes
SHA-256: b14f22c15d505070a679841b5c7a2ace211dafb8cff022ce15d01e057c231a72

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