Malicious PDF — malware analysis report

Static analysis result for SHA-256 6579bdae17d1bcf8…

MALICIOUS

PDF

81.7 KB Created: 2021-09-02 10:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4f2b6a46c53c69346584ee55a4bf9f0c SHA-1: cccab725160909a0c7b9ac23028a730791a557af SHA-256: 6579bdae17d1bcf8e6a5f39d4f692b77223313d29daa00b54daba8e6e344c69a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable domains, suggesting an attempt to obscure the final destination or evade detection. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://eurogeographyjournal.eu/admin/fckfiles/file/14468137271.pdf In PDF document text
    • http://puppies-4u.com/clients/e/e7/e7f09595da74c05d2059c741134300d2/File/dagisugurazumo.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f111f1cb6---sewenepixoforavuvoniva.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/wogawupeledadi.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608327a62db35---fovepanonana.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7eb3907e6---kanusufuvoza.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/96958027995.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/c03629cffa3fe7c4bf18c0d98f86b7b5/77038173093.pdfIn PDF document text
    • https://mimpishiosatu.com/contents//files/15137835365.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091974f8de86---19295557211.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce98ae1265---95285138626.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a130d1480---20492456120.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/60611968231.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad07b36ca35---lulibakis.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/92045768995.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/898d25d41f6e3ce1b05adc1e6871a5c2/wevojewo.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/52735029873.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/61179740465.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/63902333176.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/d0558f42833ad78b8b853f9d1abf89b8/pubusenepunavadefeje.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16081f426620ed---20455438942.pdfIn PDF document text
    • http://barksdalereunions.com/clients/869108/File/92540176550.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/440cdd13468e96ba44ac877b444071b1/mupodisepo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=unable+to+highlight+text+in+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_off0000dc0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0D 16860 bytes
SHA-256: 888d7083450e3959367d340cdb08a0460c3dba8ca395d8967e7dfb34c2674c22
font_01_sfnt_off000107da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DA 10756 bytes
SHA-256: cc7b471d6f900825db770954711ac7b8117d392e05cdb0fcff2517ad4ba52680
font_02_sfnt_off00012015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12015 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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