Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd08b4c72f44d726…

MALICIOUS

PDF

89.1 KB Created: 2021-07-26 07:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e12066a77026e1420e9f299cd8d374c1 SHA-1: f544610077bbdf1960a8ee0014c3064c842c4a00 SHA-256: bd08b4c72f44d726502d702150397f119a8485997d3d50e40ee2d3dd91261513
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites or are part of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware-hosting sites. The presence of external URIs and link farms suggests an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://thegroverestaurantnj.com/userfiles/files/97136881505.pdf In PDF document text
    • https://diaochue.vn/userfiles/file/kaxonoxufavogad.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/gapapuzimiwovadabikagul.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/7d5lj29v7e33lj7obcommp0mgl/22934339038.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/dc88ba36c4c14c555855a080003931bb/35344817658.pdfIn PDF document text
    • http://faradbox.pl/files/file/92732329341.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/nuwuzager.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/45585992982.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8949f75c1c---budilefatida.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/258395982.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/zalikagumulotixizokuku.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/6275e7a1d25020994d2c891898031914/fewarofaz.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/52646809481.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089305650316---9806162618.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607749fc17fc2---xolasagatamipejomorizibej.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/a84f388e09ef09fcb88c58fd5696b90a/nerosivofaralozuwagob.pdfIn PDF document text
    • https://stayatrosetta.com/wp-content/plugins/super-forms/uploads/php/files/1t5e9mckco2dpoundrm48i50f3/jorikuwavivazus.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094334d917f1---45575586918.pdfIn PDF document text
    • http://smit-electronic.hr/upload/datoteke/buluvupodo.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/b50a42a45172ac05e7462dd88309d372/somomewelavizujuvafik.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/modobedokotor.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/nudide.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=vuela+a+tu+libertad+alfonso+lara+castilla+resumenPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF578 10848 bytes
SHA-256: c8a3b3215c208ce762864fbbc15141ca66c2003dbcd7f671ae557eac33d8d416
font_02_sfnt_off00010e7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7D 16492 bytes
SHA-256: 56f39988b5f8b989981999fc31e819951634d53436ab9460b563151906df9cb6
font_03_sfnt_off00012550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12550 18192 bytes
SHA-256: e8e8a993a60ee824c667e72858155f8b012ed7361c9047118638bd7464801511

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