Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbcb103f2b380851…

MALICIOUS

PDF

84.5 KB Created: 2021-08-02 04:36:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c795b776b2281229e6f66ac8dba8c7d1 SHA-1: a9b9d12f61625300420233f1fc09a58673c762e5 SHA-256: fbcb103f2b3808513373962e2397a312db814d5cf5f37dd4a27fa33a4d5a81f6
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised websites or are structured as link farms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for a large number of links, suggesting an attempt to manipulate search engine results or distribute malicious content. The presence of multiple unknown URLs further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b499579fe---74603603667.pdf In PDF document text
    • https://communeouchamps.fr/userfiles/file/90117970345.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/25871421145.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/2379d6dff49fe5812c56a093cc3c7285/bidojujuj.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/somase.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/lapexured.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/4b96455b69117493d7b5c56ac7998207/32001267531.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/pusigafaturegax.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/179976c94ae50aa5d0e1816fad27bc2d/95068551682.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/a80141067c7f07529866729f1427341b/vifavemunubomewonutunuje.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/47910032786.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/vakonugiwijaguv.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/u9fbthecqqmkp9kc75gj130meu/zovesomovukozisomivesom.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/fufibigoniz.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/57740648903.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160906a7c0f29d---gibugekisobu.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffff665cff---84311769641.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/majaxam.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/p3f9nf5h9bscogkmmtmfjl6834/51952848704.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/0djstmaa886mssdldih7641svf/20817179719.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/ed1627644bcd0e6b637f21ff6061e6ae/5404395927.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/vmpp7ejtdsms8g8p0pgg79hdh7/46201095333.pdfIn PDF document text
    • http://tele-video.ru/upload/files/19902731548.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=employee+contract+renewal+letter+samplePDF 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_off0000e687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE687 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE99 17044 bytes
SHA-256: 575874cccd25e12f435be0e9e4b64f9735df7626853512a123bdbf9356852650
font_02_sfnt_off00012b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B13 10628 bytes
SHA-256: 8a7d3ea112ea9225919a1ca879da857e04f72a9c9d3442bcfbad842d8a545627

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