Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b1c37b93df15f06…

MALICIOUS

PDF

83.2 KB Created: 2021-09-07 02:34:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1e938df33f7cc0e5bb6c8d702e1f0c68 SHA-1: f9d5314f3d6e0edad0b9873f0d209552b9f12702 SHA-256: 6b1c37b93df15f06b64b6daaf716b4e3fdd496ee538559f8393ef50e1f1197ab
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to domains that appear to be compromised or used for hosting malicious files. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using such sites to distribute content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://eatatrudy.com/uploads/files/notakudifetuf.pdf In PDF document text
    • https://aslimitada.com/userfiles/file/59350275362.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/5rd8lk7815p98tkqddtrsms890/21989365877.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/jinifaditade.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6761ded3d---72991176568.pdfIn PDF document text
    • https://cubic.is/userfiles/file/dozamofisakibudareves.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/xokotemikobebufa.pdfIn PDF document text
    • https://nirvanaegitimpaket.com/calisma2/files/uploads/nofelokopobop.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/mifiz.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/nibuzeditotomelomagufagi.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/kalipolot.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/2d137bcaa931ae96bfc131b9adcdf401/wositodifolorurowajavuxa.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/tqcil2m25bj9h1lnfp5rqnd0o7/19650591871.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b10d638afc---vidutesezabixuvafemaw.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/kokenabexan.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e68cfaca933---41383084646.pdfIn PDF document text
    • https://mimpishio1.com/contents//files/faguzavedewok.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/72141929781.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c027a301da5---bosepinunozomuwamukiv.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/kakaret.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/93130566907.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109060205418389.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/72662379621.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=are+you+addicted+novel+english+pdf+downloadPDF 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_off0000d9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BE 18788 bytes
SHA-256: 794220edff99e556e21245c0805ff446ab8e7b6e8368d9bf71cd780a53d735e2
font_02_sfnt_off000122eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EB 11248 bytes
SHA-256: d73ced7b765cc4b1378c55dff0d5e500f2af65eb89ac3de820ea2b3fbc99315c

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