Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4c74d2751de39c7…

MALICIOUS

PDF

75.4 KB Created: 2021-09-01 01:14:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 729e529328dca7328784bbf474ad0d79 SHA-1: 7b15a625c2b037e42165361cb5b75c71e5c85369 SHA-256: e4c74d2751de39c76b32b6315388d6998eec17c5a41ad2086e94dea518239998
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://zippy-inc.com/app/webroot/userfiles/files/92681870742.pdf In PDF document text
    • http://woods-china.cn/ci2/userfiles/files/20210617052515.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/0c2e0ab3130cad26deaf02f3887c4f27/17362736670.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/kowomabafosodidin.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/veremuvujekitifodezulusi.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/59423020481.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/90271106913.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/74293600330.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160ade57199733---37473875139.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079b0d2ac217---dolasupu.pdfIn PDF document text
    • https://thietbiotoviet.com/Images_upload/files/vasugasujejapivafudati.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/2ik5vu6aepptr6rr93br3ervu0/sejigelomovakuxofenipiw.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/36f50d2491a5c60e1f2ed3c46bfd5b74/dabetikixosekufa.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/66212628871.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160acde918bfdc---ligufusubutak.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/88081513368.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/13809786843.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/jo3kmdbiu0m40gfd8d4kiuo1tt/xotarozagereda.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/numiwiralotosi.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/84761206713.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/mupipasokaw.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/dilogosamiv.pdfIn PDF document text
    • https://drvishweshwari.in/userfiles/file/84175224286.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/ad72379f7aa2f683f2e1758ef181446f/26174630689.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/28076147085.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=meaning+of+sea+voyagePDF 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_off0000becb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBECB 18808 bytes
SHA-256: 7fc5ee70fc171e05139224cb3ce60e9232ae3a3cef71f591a937ef2816f1dc98
font_01_sfnt_off0000ef08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF08 10316 bytes
SHA-256: f133f483a23b5b53f44d4dcce365edf9ed73d7b75fdeb375e8bcf4136f2ebb0e
font_02_sfnt_off00010676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10676 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1