Malicious PDF — malware analysis report

Static analysis result for SHA-256 98cb373ac4cfc89e…

MALICIOUS

PDF

88.1 KB Created: 2021-08-17 07:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3ed0f4df511ce84d16ac844eb1b7e40b SHA-1: dcf13b3c4bc8c5477b22c2a74969018650e1480f SHA-256: 98cb373ac4cfc89e07387f3bf42c7ef6637069c27f183667061eea8bb85aeeab
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other domains. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://coretry.ru/uplcv?utm_term=mandalas+libros+pdf+gratis+blogspot PDF link annotation
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/24e12b22ee948c6c3119167e290b3cc7/fenoxag.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/f06de33622718cb417c82940d3cbf8e1/lukenulufufefotolavu.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/vonud.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609efab239b76---79133236381.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/sufalogavilotafusumi.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/57c11bf316f3745f3ac0043acb7d1942/72064858580.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/tufuvigigazewafamumopa.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/4218a599f8bbf107a34b3094e7ce5700/resemizepovamajenewaz.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/0730e0a95761e83c801043c3d888886f/risuxudifibipalugow.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/88696629420.pdfIn PDF document text
    • http://accronline.com/userfiles/file/begimusag.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/5078935749.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609857090016b---29372801773.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/ucl19tb0nk14qoni10216klrqn/54681161835.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/xifenafobirufe.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074543c235f1---wutofusuvadaba.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/masoxes.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff9a4d5e3d---21580648026.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077c173a3a88---mumafomoku.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/novonojodixevasazagoz.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/tubadaziwinadotapulan.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/bazuva.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_off0000f431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF431 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C43 17376 bytes
SHA-256: 792e9c81f666d78a00eb3c6f5d7555eaa36f2a8528151e8ac8be577f702b832d
font_02_sfnt_off00013812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13812 10676 bytes
SHA-256: 6f8378f4bde775cc393ed4b5ffb66ee29ec464bf0a835ba23c4c481b28390726

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