Malicious PDF — malware analysis report

Static analysis result for SHA-256 3975c03fc6b8108d…

MALICIOUS

PDF

111.2 KB Created: 2021-06-17 16:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 18c68a082d0c6bbee264c90ab3c6a40f SHA-1: e901ebc110c1386d02a66e32896ac04429c05471 SHA-256: 3975c03fc6b8108d425de08d4d6912ea0ea32016be5d3d4af52d89ee8017dbf1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. The document body, though heavily obfuscated, appears to be a lure related to a calculator, aiming to trick users into visiting these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c965d8ddd5---gunavogawe.pdf In PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b98f4adee2a.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/nixofivufulokupopoxaja.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad3141f62a---19035906593.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5058d9a805---dawojoju.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a16c343a890---risebolug.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/23357512110.pdfIn PDF document text
    • http://benrassam.com/uploads/files/moregumupipi.pdfIn PDF document text
    • http://pmmagic.vn/userfiles/file/vodawowobonelabubivazuvav.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/07a361d51cce7f173441844072366cf3/simatotamodisivevokitup.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/44a443676eba3e8811731695bf15fbde/sokarelimolumorex.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/69519675518.pdfIn PDF document text
    • http://thongthien.vn/upload/files/gixos.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/a7692c7671206f101049572a250af38e/vuwigapuve.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/3ac8672a0b95442f5a12573fe332fbf9/wuputevomazixusaximedafa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=tangent+of+a+circle+calculatorPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017e54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E54 4820 bytes
SHA-256: bd6f88ff22d7a3c82aee07f6a12d7d5174ce19ef9461ea587d359153c2819ebc
font_01_sfnt_off00018ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18ECF 9824 bytes
SHA-256: 63eac9e0da1cdb819d9cfe32366f8acdb09079cde0288d482af2dd91ee41e911

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