Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff6d40235210fd3b…

MALICIOUS

PDF

74.4 KB Created: 2021-09-01 11:18:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2f4320948edba89ef6e63294bc35cfa2 SHA-1: f8d3d2f9ec9cc4b3ed94858c7f2ca8b1fb02c06c SHA-256: ff6d40235210fd3b601634cc40e8a2052ce3a6b838d302c6d80819a4b45b3539
156 Risk Score

Malware Insights

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

The PDF contains numerous links to various domains, many of which are identified as compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://cesishotel.lv/res/wysiwyg/file/95505527755.pdf In PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/46184811453.pdfIn PDF document text
    • http://konyaozgunmobilya.com/userfiles/file/muxerefuberuvababegula.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740ede98088---gebegadom.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608874cd0dc06---39115337944.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/4v86qilbfkd1ch3at6hm936c5p/nilagalewiv.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082558cc8287---gupikavejon.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8ea6bdd67---rinumuxovexawevu.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/c286070161fea7cbb4ad613d6db5b5ac/26669512035.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f109eaca1b---saxularitewurojef.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/c78200333eec7ea372d16dd1d8166bea/43033529766.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/afa56bdc2957ce638d6d6bc9cf4add0c/vaxizuxamenozabifiwaxose.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/94571147656.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083c32e7c603---41886399313.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/movibeki.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/e1ce64cc7191f5b953c9c81beb41c8d8/tewegaxowimaxufiradepuze.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/fb256b7696bf9458723e5f1264875206/sajulewotifitaxub.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/27582256448.pdfIn PDF document text
    • http://faptvmedia.com/userfiles/file/72822244576.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/161277c70abdff---3508988502.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/31185961063.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/vufovedujofobuxigutesino.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/110483531660e608aec05db.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/19315159009.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=about+eukaryotic+cellPDF 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_off0000c393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC393 16104 bytes
SHA-256: c0c5b72925985b1bd8a7093bbe5b04d16fa81cfd8767af41ab92d09afeb0fd7f
font_01_sfnt_off0000ec95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC95 10376 bytes
SHA-256: c8c55125f7710b9b2bb738c5f037bd0e340fded3b1f64c060e96a954d3c70797
font_02_sfnt_off00010444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10444 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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