Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e4c09c40709b67e…

MALICIOUS

PDF

79.4 KB Created: 2021-08-29 08:27:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bac855ce96c103714fdf3de8dc391587 SHA-1: 6740fa604090c4b048ea0e9996b76254704e67ce SHA-256: 1e4c09c40709b67e24b352dd460c07df207f6bb501d0957c9d089ae06bff21af
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on compromised websites or disposable domains, suggesting a link farm used for redirection. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass initial security scans. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://shipsupply.ru/userfiles/files/20598436685.pdf In PDF document text
    • http://afgventuregroup.com/cfiles/file/57699764568.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/napimedetewe.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/60967273337.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16114381d63742---memomofedan.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/9916557c9022e0a7b3de96e74417b6d5/xigavurujiw.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/1986008488.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/selogijelezegezupi.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/90871933576.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16083d0ef3d468---rozowotig.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/t9t0innsapbrmho351gagfaelh/66608412944.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/zitulinigesixedurojugidim.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210730_041347.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/a3b902970a8c9a77c1c7ae9d1e75efe3/37308908953.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/3bf8842e38c2a9aeab99f53378a4848d/nijutanesabibaxe.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/5a249dd7bfbf5c83864d6b30d9f45065/gajoragazeguso.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/07/202107300902246327.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/82019979949.pdfIn PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/marutazaza.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/66c17c4bdbd685cb6aa2219f9fc51696/xuvoraliwufogajate.pdfIn PDF document text
    • https://lazerom.pro/media/file/kedolotomefebana.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091093933dd6---nusarapabekifisoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=bleeding+after+normal+deliveryPDF link annotation
    • 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_off0000d183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD183 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99A 10760 bytes
SHA-256: 00f033022044dea00cb95ff1c21053c87fe058054721c1fd379d9d4818835384
font_02_sfnt_off00010224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10224 17172 bytes
SHA-256: 5bf57320bf737d1fefe20d9fc653ffd58b3d3cb3176357c63e748eb4f19cff62

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