Malicious PDF — malware analysis report

Static analysis result for SHA-256 386d610db7ca997a…

MALICIOUS

PDF

98.2 KB Created: 2021-06-28 03:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bfaca4b80e2900d59b87e25d9d778eda SHA-1: fca67b2abff0bbaf088bf8a35a091c6cedfd7195 SHA-256: 386d610db7ca997a68ae03988ea6c8fa09e4852a75b94df92b5f23dd234527a4
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs and link farms pointing to compromised WordPress upload directories and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is unreadable, but the heuristics strongly indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9739

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 https://inwebjor.ru/uplcv?utm_term=bts+the+best+moment+in+life+pt+2 PDF link annotation
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bb243834d---83164256097.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/84575099343.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608126bb3bc94---zatapozubigesuju.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/6r2l3a2ldaer6i3hhj08ilurg6/nuxara.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/27735642266.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/lolajolakelagajipiki.pdfIn PDF document text
    • http://midlandhigh65.com/clients/6/68/682e31fde28f8c6bff7ebba57332ef5f/File/69747203911.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/vaxufidosatuligimaw.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607800b93f92a---molijomumotepuladi.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075dd4683971---fetileburezutudurosupa.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/79965898035.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ce6ae150e3e---87878904569.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe9c16e88f---73756568694.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/49853741712.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/nivulogasiruwenibetaz.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/ronojukalopinevulojavado.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/65258318914.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/fevum.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/a20d19f835ff94c52e6e577ebf353cda/labuworupanogojo.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/zowavosozanubabago.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/9238597672.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/28258ff779f1d12449a6bfb27fd34ca8/ganabi.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/64864485892.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/70ef8f74b8cf5e1f4fb26e090e798f68/7804319255.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF332 19892 bytes
SHA-256: b2502abe3e9e80b220ffbc787a15154f785ffad12bb53388802be6618c774fb5
font_01_sfnt_off0001254f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254F 10676 bytes
SHA-256: ec1bc0a2691f42c288ec98200ea6f742e873eb8b3e67f306518f4109ed3a18b5
font_02_sfnt_off00013d5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D5F 3508 bytes
SHA-256: 2ff2f51e5829d8600ed950edf35d19d7a0d198d6ceb35986264b8bc041bb9347
font_03_sfnt_off00014b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B7E 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_04_sfnt_off000160c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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