Malicious PDF — malware analysis report

Static analysis result for SHA-256 57c841e2479b5883…

MALICIOUS

PDF

78.4 KB Created: 2021-07-31 20:12:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 6e29519165c7332330279485eed3a63b SHA-1: 768374d610b78ef5976e497236645691fab0a980 SHA-256: 57c841e2479b588352dfc74001885863b42a0de60e31b734b291e45812a55613
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external URIs, many pointing to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for executing malicious code or redirecting the user to one of the numerous malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=relative+clause+comma+exercises PDF link annotation
    • http://seabeachthailand.com/UserFiles/file/xiwit.pdfIn PDF document text
    • http://thecountryclub32055.com/userimages/finovabapurukajusaputep.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609bec76d0ebe---jisedugefu.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079102c868ac---wenisevijakar.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609234cf571f6---kobubabumolujororexobeka.pdfIn PDF document text
    • http://airbaankhubon.com/userfiles/file/66589230679.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/bazanubox.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/6684255626.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/roenqasrv2i6rcpha1k3d6eas4/zexepotupowodakil.pdfIn PDF document text
    • https://rumahbaruku.com/contents//files/67577639125.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/487add270c38417b964e2a72833e34b2/34467585019.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16085b6b941bcb---78592105361.pdfIn PDF document text
    • http://jkmdc.com/aversystem.com/userfiles/file/rugokiragawizonon.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/waviviguvisesiv.pdfIn PDF document text
    • http://dsraxys.com/uploads/jobesedezonoguxixerawo.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/fajakip.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/11206274360.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/vuvaxag.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/68c1df3dfa50b40735337a88c037b318/jupezagasuwavefawulidod.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ceb077a874c---zopawifujuxoborafe.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/86981778915.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_off0000cd00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD00 10600 bytes
SHA-256: 57c715f42e8d50df5da44513b97c25271ed591d4997bddd6688c64ad5e7792e9
font_01_sfnt_off0000e54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54A 17420 bytes
SHA-256: ef9fd3568ce60cb623dc25c89d6afd35a76b91fb3870d26f7311c70c05516229
font_02_sfnt_off000112d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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