Malicious PDF — malware analysis report

Static analysis result for SHA-256 b776d8b8e86cf577…

MALICIOUS

PDF

70.4 KB Created: 2021-09-29 14:15:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d2ef5e963f51d2d2d8f329d4a2d9d48d SHA-1: 953836036397aa9c1bd110077768b7502e3b03ad SHA-256: b776d8b8e86cf577a5ed9b0f449712220c15acdeba9bf238badea2682553453f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure and URL analysis point to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://divodizain.ru/ckfinder/userfiles/files/wufojuk.pdf In PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/76089449125.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/52499228349.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/09/03/file/20210903_162119_104.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/44851368395.pdfIn PDF document text
    • http://lawngo.net/fckfiles/30056439178.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/bidoxezub.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/sijaguz.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/vomevivazipadixaroliz.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/66140950993.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/jajeviwolisijojexojizakum.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/dikojitejogelekize.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/22351189694.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148af4d8ea3f---garebigupasupa.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/80249503342.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/e5a16768fdeb3838a2c18f11f8ba1308/pifowafa.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/44583663564.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/31e27119bb5526f140fe0b4a4b4ee592/15174354430.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146fb05b401c---gefabinalab.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/17102375502.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/loneto.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/vojovolexogukajemisomipev.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/4a8e2e3d548c0b728849a4ad020071e4/povomubipubivikav.pdfIn PDF document text
    • http://wirtrauenuns.ch/images/file/bulijowa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=best+free+text+to+speech+app+for+androidPDF 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_off0000b281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB281 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA93 16132 bytes
SHA-256: 6d9eb07d4e08a4d4927b38805f7580964d41bce9c45165b3b8c3fbaec6e5d579
font_02_sfnt_off0000f285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF285 10824 bytes
SHA-256: 39465aaaa79f246a3c33396cbed6cb3c6ab268f3e6f8fde3ecd51b5add49d871

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