Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1e8b489d2af1cc5…

MALICIOUS

PDF

81.3 KB Created: 2021-09-06 22:35:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8c00487aa795b8b5230df69e9286af17 SHA-1: 84020dcfd438dc0872e50c46779fe3e059a21861 SHA-256: c1e8b489d2af1cc5ecc918301458bf3ca197a6bcb7467a10bc21c1257c511496
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, with the latter identifying it as a phishing trojan. No scripts were extracted, but the extensive use of external links is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://ketchas.ru/uplcv?utm_term=networking+interview+questions+and+answers+mcq+pdf PDF link annotation
    • http://panda-es.tokyo/yamituki-n/uploads/files/lasuwogesaf.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/vikiju.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/d6f67b3e9b9aba02f0fab94ac4b2ad9c/nipunanapuxolazawe.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/semidugufada.pdfIn PDF document text
    • https://12waktu.com/contents//files/91099983081.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/vuburasikokimaduzuzixer.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf496b1a8f---3174671456.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/fa1ea90682d4223b605c276ce0c89c24/bikeze.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca81a7d251---kobalanovidikib.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/50563480045.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/76447707082.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/zemos.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/zekumabuxuvavevukanu.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/kemota.pdfIn PDF document text
    • https://kenadong.com/contents/files/pipijigufomow.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/86508645135.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071fc47708d2---sofodogi.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/b7cd159e9757f672374435020bb29826/74528998829.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff39dd2203---tuwagopilojubitab.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/gimezemonitolomelula.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/95264785962.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/viie82s7uto344v4njefi83a12/73636919843.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_off0000d790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD790 11384 bytes
SHA-256: 5131248af491bf2f3a80a5939abe0114d6f79cadebb53fa9885e941878ee10df
font_01_sfnt_off0000f1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F7 17452 bytes
SHA-256: fb13c7c8f8888a1920af355bfad42a690e17ce85eb1a5f9359b404cc1c23961f
font_02_sfnt_off00011f1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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