Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cff22a5382eb063…

MALICIOUS

PDF

74.7 KB Created: 2021-09-04 01:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 02ca3bfff410c7f197801279acaab302 SHA-1: b57bd235f377afe4aa1e1a55650ba5d5d195f08f SHA-256: 9cff22a5382eb063fdb56207f28e54e3be4400ce6d0e3da539afbc9b2acc9604
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099db0609aca---70124862392.pdf In PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/44ca8fd6d3031e7257f71a49f83ba6fd/gawebowewig.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/rijinulaminele.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/6d0d9c0e8f17af1fcd4da69bf7afedc1/16965414495.pdfIn PDF document text
    • http://ipai-bg.eu/img/file/6022987216.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/muvinabivabumap.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/49176690281.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbbee8db3a---12866709665.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/58663402104.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/29554848951.pdfIn PDF document text
    • http://becucci.it/userfiles/files/jedupikove.pdfIn PDF document text
    • http://kezheng.net/Upload/file/46940022519.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/99821324606.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e63f96d5b59---71007609772.pdfIn PDF document text
    • https://nanosoft.mn/images/content/File/52779814021.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/lu1jsg3umo4cqmbbau1mhhstn6/bomularusufuwexazuva.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/11975432370.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/xewofazasanibud.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/7b7e31d3fbcddac9c0afca6cf44fe68d/14234111113.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/99cb7c6c7ff33a70df7156f5aa89f4e4/91570767341.pdfIn PDF document text
    • http://954move.com/clients/4890/File/zufelapozufaxonuw.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613295ac7d854---juwilumoxufubidoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=ford+focus+2007+manual+ukPDF 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_off0000bed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBED0 10776 bytes
SHA-256: b9d4bceeca09ea79f3a7f4ac0c283c12ae0020a14d7ecfd45313a0061f306a80
font_01_sfnt_off0000d7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B3 17292 bytes
SHA-256: c12ac49d9c46fad974ef350c609c65701d3db952fe6bf1692797dc4c362020e8
font_02_sfnt_off0001049e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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