Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc6ed13d3439f086…

MALICIOUS

PDF

84.3 KB Created: 2021-09-20 15:38:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c35b173dae756141c53b0119bd2e7803 SHA-1: a146d4d56344f9b8985715b16ccc5c86dc0fde87 SHA-256: bc6ed13d3439f086842210d1a3ca869a6cf2f4b404123ff55b6e656f6ec0941a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various disposable hosting sites, a common tactic for distributing malware. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a method to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://laborke.ru/uplcv?utm_term=how+to+hack+telegram+account+in+tamil PDF link annotation
    • http://locke-3c.tw/uploads/files/202109040128345188.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021091023383922448.pdfIn PDF document text
    • http://cobmedia.hu/include/31101532877.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/kejuko.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/xuvozenuwuzodejazukadever.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/safanunosaredadobewas.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/29328540868.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614172a846578---51902485137.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/mezil.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/serexoxejajuwesuxe.pdfIn PDF document text
    • http://infas.cz/images/wiswig/file/29921562546.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/64590961014.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/tiwepupimunolitife.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/161459cb3b326e---wusukowavavosidi.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/56209056937.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/batemepukedomumef.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/c97a4490aa96f542417a700c8c0f3a66/forafunos.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/riwototijuvosolegolixuz.pdfIn PDF document text
    • http://carbontuning.ru/file/gegezixurekuk.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1631570385belebuwizexigama.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/97865250001.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/kowekeboravarenuk.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/69766530641.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_off0000dfd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EA 10780 bytes
SHA-256: fc7a7c24789c1a27324b04c0bdbffc75e0f9871179d90d1dbd9a78b1a7b1446f
font_02_sfnt_off00011097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11097 19664 bytes
SHA-256: aa62ed2b9d479644b37c768463e7ec1703823c39b1cb171e0714ae0088d4d885

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