Malicious PDF — malware analysis report

Static analysis result for SHA-256 08c2e01e054e9548…

MALICIOUS

PDF

82.7 KB Created: 2021-09-21 06:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4317619600a91ab27f4da895b258e506 SHA-1: c6125f7f6b1277ea21aaeecbc77e84d984f33e09 SHA-256: 08c2e01e054e9548493a3223cedab2d6d724ef2ba8e2b3d73eb639fdf668f527
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. Additionally, the document features a link farm with numerous URLs, many of which point to other PDF files hosted on potentially compromised or disposable domains, suggesting an attempt to distribute further malicious content or conduct phishing. The presence of embedded JavaScript indicates an intent to execute code, likely to download and run a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mavachhaiphong.com/upload/files/85497436522.pdf In PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/rukizupo.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/57336926890.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/peluxivi.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec054ef677---43906466755.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/79667972724.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613849f6992a4---menanubujuzegixo.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109170009463984.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/pokowaza.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ced80ceb97---rexezumifafipukevijafus.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/70236121292.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/c8c9dc44311dc9a709c798fa66fdccb8/letumuw.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/pusukipomutob.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371b903946e---piwutijorutemibosim.pdfIn PDF document text
    • http://topstec.com/d/files/zenapu.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/vogasinoxonisisi.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/18477996638.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/502t5h0le1p6cj6gqsujroe8gp/9478990024.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/78188371277.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///94151816486.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=blitz+brigade+online+fps+fun+mod+apkPDF 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_off0000dfd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD9 16772 bytes
SHA-256: 73781eca72513eeb0caa7e41cd370dd622c1cd6139a0f37fcbed610869b49550
font_01_sfnt_off00010b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6D 11284 bytes
SHA-256: ed0dce6483207b0ee23f59470028df3da53dd3d40d9186f013ec61d8c16e4113
font_02_sfnt_off00012592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12592 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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