Malicious PDF — malware analysis report

Static analysis result for SHA-256 f53c86503079936f…

MALICIOUS

PDF

102.3 KB Created: 2021-09-16 20:32:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 19fd6f425d3d3d01d41ec41db66dbbf6 SHA-1: 500077a72edb5b27706828f24897483e0b7c7a4b SHA-256: f53c86503079936f02e6c588429c943bdcc67224a1b5a05cf51356453a1be4a0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://keluargamimpi2.com/contents/files/23554444754.pdf In PDF document text
    • https://valleyrentals.com/userfiles/file/41480033919.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161380fc989b47---bixilureve.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/dupotolidoxevazono.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/wedefe.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/65ee8f41b4eef97e78f32512a7eacd78/46476133839.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/b07o5jm0qs7v0a4nag22sbbjeg/jenisunuvolevufa.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/tukemalajaxepisizefamagi.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/rupurememevanojivevupobow.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/37240824056.pdfIn PDF document text
    • https://digireg.lu/upload/lureboregadifilibup.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/jezivezuzavex.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/nipoj.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/wareregesu.pdfIn PDF document text
    • http://wsm.hk/images/files/30518523003.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/161427390b0338---53459683817.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/82366130129.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/25559153358.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/qtakoklbkaqqv44rujkpg3snp5/semulesulokivezeg.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/rawokunefemu.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/74527677332.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/28147290513.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210911033654.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=square+root+of+10+000PDF 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_off00012864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12864 10292 bytes
SHA-256: 8aca7a74e1327f3592dfef1077b904da6fb7d0960aeddf923fc2d537cf165c36
font_01_sfnt_off00013fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FC5 19996 bytes
SHA-256: 39a474c17b38d4e95a7fcabdf91cbf9fa34c96c44bbc496016d439db18ca2e8b
font_02_sfnt_off000173a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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