Malicious PDF — malware analysis report

Static analysis result for SHA-256 31e38e9a718cab21…

MALICIOUS

PDF

72.2 KB Created: 2021-09-10 22:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8e2f4ce275688c4f07d9aec3c8a30941 SHA-1: 4ad9a4e742576dbe55e1c09adba7d986714e8317 SHA-256: 31e38e9a718cab219f02d8a7be9fe684ff02f88b9996b93914487c334c446413
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, directing users to potentially compromised or disposable hosting sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using non-clustered links on disposable hosting, suggesting an attempt to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sbnjl.com/userfiles/files/99395020096.pdf In PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/gepewaximekamoxo.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/gijumodojefekuwodosadixo.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/zegej.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/18436286667.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/30c141013a2a82e53b1237973c762489/27310949556.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/ec1162ade8242e9a6b18a220c2132f4f/82004248544.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/20973070257.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210901162126.pdfIn PDF document text
    • https://recrut.com/files/files/33366984033.pdfIn PDF document text
    • http://ormansagszive.hu/upload/file/lirasubobuteranidumakobig.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/balew.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/80579251390.pdfIn PDF document text
    • http://paradoxine.com/upload/files/19485548972.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/16309469522064576297.pdfIn PDF document text
    • http://fjsxsx558.com/upload/files/vidaka.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/39377732177.pdfIn PDF document text
    • https://birotex.rs/images/files/49237088315.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/mizifitosobuluwub.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/lololubosofemeb.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/pononu.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613720ab24158---fefab.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/78706148052.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/filufidisamedipuk.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/4410745946.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/kapumiwamaze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=top+five+biggest+countriesPDF 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_off0000b75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB75F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF71 16636 bytes
SHA-256: 4effbbb0469c5c79b53528144ebc6a1de1fd597540b83f8c93217c24334953e5
font_02_sfnt_off0000fa95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA95 10716 bytes
SHA-256: 16c66b58d332c469e8a1e1f3a06029c86de9200ed448a8cc86df2343f5b70130

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