Malicious PDF — malware analysis report

Static analysis result for SHA-256 0437f682ade25dc1…

MALICIOUS

PDF

83.9 KB Created: 2021-09-17 21:18:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2e5bf95f8fb982f472623d1c4b996356 SHA-1: 869675e9bfa2dde8913ad01d2c9bf2092396db9d SHA-256: 0437f682ade25dc16a9cad21b8b20afbf88214d89fd4166f103702220df851d5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which appear to be disposable or compromised hosting. The heuristic PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM indicate a pattern of distributing malware through link farms. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://oniceh.ru/uplcv?utm_term=among+us+download+pc+apk PDF link annotation
    • http://wwm-quanta.com/upload/files/luzuvidod.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/24686518436.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/roxefikawejiroruvez.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/70895933844.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/nukofiwi.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/fiwebozek.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/kenovovup.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/jusaviweviwixepe.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161325459b37c3---lilezuwed.pdfIn PDF document text
    • http://timebymtm.com/upload/files/58195557057.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///29949432374.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/e1b96fcb7052150cdfd428ca252ca533/fobaxufetomumimetifon.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/givifufa.pdfIn PDF document text
    • https://servauto.fr/img/user/file/xurudi.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/1186629133.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/77348133778.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/4637109185.pdfIn PDF document text
    • http://esejsc.com/upload/files/22118931756.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/bufejubepojuxunu.pdfIn PDF document text
    • http://apismorava.eu/docs/xubituduvekevedokij.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376c866eeec---67900655882.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/kavanopexekudalafuwi.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6aa63ec88---wobobavidovibimegoxoge.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/85417102287.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/mixadedigawokavijowen.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_off0000e1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AD 10696 bytes
SHA-256: ad2d46bdfa55797d01f4e0828397dc997953104c625dbc3a850c7ff616e4dd4f
font_01_sfnt_off0000fa16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA16 18380 bytes
SHA-256: 15327812574ae5909e6a4beb2ad8d774e59eee20195ba8dcaa71f14b6eff7b19
font_02_sfnt_off000129bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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