Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cfb116238d769d3…

MALICIOUS

PDF

68.5 KB Created: 2021-09-05 22:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 81aea03df3fa3e48e438935122c6824d SHA-1: 988243ba2bccfdeb36d6aaf9ce0c3220d40aae63 SHA-256: 6cfb116238d769d3868db4bf9dad08d608a4e0cd8bf170b9f06904c0fa93abbe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to potentially compromised or disposable hosting sites. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer, likely to redirect the user to malicious sites or download further payloads. The PDF link farm heuristic indicates a deliberate attempt to create a large number of links, possibly for SEO manipulation or to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://xetnghiemadndanang.com/upload/userfiles/files/jalovoziku.pdf In PDF document text
    • http://prota.ru/upload/files/kebidezezerosipiwa.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/41613490987.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/132946cb762e553b9add7f871c5de275/fatimebalo.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/67923030916.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/21240885091.pdfIn PDF document text
    • http://trieuduong.com/images/Download/noxatevaxinujojuje.pdfIn PDF document text
    • http://cesmclassof68cheyennewy.com/clients/82478/File/26397006345.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/05bc9054fcbeaf77a5470471542f7e50/zisagowasot.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/gebodebazo.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/de0780cf0b61e2fdc98d92f118bc0147/72364482161.pdfIn PDF document text
    • https://ka-base.no/images_students/files/mixobewakuxobogogiwe.pdfIn PDF document text
    • http://entiambalaj.com/upload/file/vazuwokudixozekamibumop.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/55956499802.pdfIn PDF document text
    • http://signaturecruise.com/js/ckfinder/userfiles/files/35187167415.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/3c2c2632553751ea13a6ad50de8f1635/tijom.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210617201059_jdbgje.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/21aed90d65ea368d97413e3bf1bcd782/lodosodosi.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbaa2a5fef1---93466169638.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609be2043e26d---27143453395.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083118c439be---nozagosubevere.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=types+of+angles+quiz+pdfPDF 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_off0000aed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAED6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E8 15544 bytes
SHA-256: 53ba9a06c8f046d2fe4d16ba0fdb9dcaec41a2e06c1f1e8cbe3fb90cdab9a33d
font_02_sfnt_off0000ec3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3A 10860 bytes
SHA-256: dca9e3f6d2f39eb131dbde769f39bc8162e80029740cb796a21bd9f4e78f9031

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