Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5e3385e8836b495…

MALICIOUS

PDF

89.3 KB Created: 2021-07-02 21:09:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: eba83ea861eb7a8ac5525224c304bebc SHA-1: a7302b9d930c77e836fb199027526579198c3c6e SHA-256: b5e3385e8836b495592add4af496e600cde3a05196b78a574dec0d3b2e16ad56
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous external URIs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it functions as a link farm to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://allytemp.ru/uplcv?utm_term=flowers+in+animal+crossing+new+horizons PDF link annotation
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/928d326ee1d91a2682fe317afc87f074/daxelozuvagukeromokowasa.pdfIn PDF document text
    • https://dm288.rs/slicice/file/piloxesexikumebevumexeji.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfaca001225---78448551846.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/78506391281.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b650c981dd7---kuxutexareb.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/98406905839.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/omgri7p8nklg9ki7trfvfr5b40/70602715990.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/pavojovajuvirororax.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce9ced1146---luwasotunamarubivigor.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/67hhgk0s8un7415itkiqrhm6ru/77360352566.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/29302862678.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/setokuz.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a71846fe7---70191926010.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/23557427846.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a16cbb5188b---xemak.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/6076927695.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ead0d7813b---lilosasurekezoxoja.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1366372b2---zikuvedot.pdfIn PDF document text
    • http://standardamulet.com/files/files/13428688761.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/7b626430918e483210c127cc00f7f330/49639392354.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/707dff3ef15a186e97181bdfa4013c67/53974568232.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160a8481c51f6e---73066851986.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160afeb266fcdc---49240028852.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/a6bad70ab886bdd2925d63281d12ad7b/towawozaviregitemepebako.pdfIn PDF document text
    • 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_off0000fa1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001122e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122E 16924 bytes
SHA-256: c5ef7fe13617adb05b68e74a3a281e099919beb81e98a850de8f28cc46dfb747
font_02_sfnt_off00013d9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D9A 10700 bytes
SHA-256: 204aae81e2419b338895d6d61b6c46602379483ff64a158f6c077025aacb2f89

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