Malicious PDF — malware analysis report

Static analysis result for SHA-256 c18a8128ee8131e6…

MALICIOUS

PDF

79.9 KB Created: 2021-08-25 23:05:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 48c462f94b56424809785a5d23e9a709 SHA-1: 9a2cb080ecf96203257707d11414fbc230b30546 SHA-256: c18a8128ee8131e6a639d45c74f8dc9434b22f0bc39a318431337fde3fd7ea6d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and compromised CMS upload links indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/k4i8haqkvgj743un8d2mnsidgp/893977748.pdf In PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6a9c2920bb---36491456874.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf871cc208---gilezepaku.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/499576211.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/5f813764e6d2df367e8c40d98b2de78f/javep.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/61852483317.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160770eccc2f21---fazuxosibuvazuniz.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5c2e2bed3---89324475650.pdfIn PDF document text
    • https://altbuket.ru/files/lagozuwisoninelipu.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/zinapi.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/pefap.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/mebogaxeluxerili.pdfIn PDF document text
    • https://hanmarklight.com/UploadFile/files/zapoxazojagewe.pdfIn PDF document text
    • http://cepsagibyachtfuels.com/images/photos/74697096210.pdfIn PDF document text
    • http://hydrem.ru/images/file/76299794596.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074caa719d0c---marepisetide.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210706130908.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/es80ajupgsj6i0bnar30fj3k10/15568948319.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2658969b8b---9707725844.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160c55f231c9d9---72949161878.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c3d4d25a5---dakunagejiponowilax.pdfIn PDF document text
    • http://nessium.net/userfiles/file/95357420040.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=motion+for+modification+of+child+supportPDF 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_off0000d615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD615 16496 bytes
SHA-256: b60ac813b24769b09941e88f69697e68443792d4d81f8384f8f8878c8a4b9f01
font_01_sfnt_off00010109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10109 10848 bytes
SHA-256: 80f3e342b89c1b3a255ff039549eaa63ccd1ea3efd1bf58b066ef8c4d13e4987
font_02_sfnt_off000119e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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