Malicious PDF — malware analysis report

Static analysis result for SHA-256 211910fbcd4e6a64…

MALICIOUS

PDF

83.7 KB Created: 2021-09-05 14:00:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eec62d261e350440add0e449addfef17 SHA-1: 3f1bc97b8e91da660398c4800f3c19e428172b2c SHA-256: 211910fbcd4e6a64f3f80254931b874570709dc75eb44eae8ddf97d2c31b933d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous links pointing to various domains, many of which are hosted on compromised CMS upload directories or appear to be disposable. This suggests the document is designed as a link farm to redirect users to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d691be2b8---votoradule.pdf In PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca7c425063---bilaxeved.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/86554744726.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/badomidetebifudajibumaw.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/aj73qrcltqgcn4lo4eaah5qg9r/19196042672.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/b986703401ceb9daa2ffe2ef8668f481/sabakijumutekako.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/46496756829.pdfIn PDF document text
    • https://asken.as/bilder/file/pevale.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/nesevirafebimoraliju.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210507022137_1106789985.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/80240155033.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/wivofosawujid.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/66405816377.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a457cf098dd---mosozi.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/sajaz.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/64809504777.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/57179813871.pdfIn PDF document text
    • http://sibmetiz.ru/upload_picture/6763453368.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/15569029876.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/7b69f8bc37e2383a4234ffa03686b323/sesiwaxokofogiz.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/80589557733.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d34c67cbb3---79498074530.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b2aeec04cda---voxemovedon.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/24518456386.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/957b88de698f3b49af7ebc4874a66f8c/tusutenavesivukij.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/xevokugigevipujerevawaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=water+services+act+2007+pdfPDF 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_off0000e1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DB 17892 bytes
SHA-256: 50af57b1a7c9ebc766bdd45f16d695e54e6158304e2d91c509fe657066b6e413
font_01_sfnt_off00011045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11045 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001285c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285C 10692 bytes
SHA-256: e04e79ab496bc3f12a0f433c445db837b5960afff4e313b1d2a9a88b0bfc89d7

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