Malicious PDF — malware analysis report

Static analysis result for SHA-256 75ad732a47ea20dc…

MALICIOUS

PDF

87.6 KB Created: 2021-09-19 09:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5a405c4b639e6e97c9ba85a793072e1f SHA-1: 6c3a3e1cd45c75ccf65f155f128ffd0af85bedae SHA-256: 75ad732a47ea20dc6929f6a2d8759efe2aef9e57f80901eb7ecd775858a70ad2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable domains or compromised WordPress sites, indicating a link farm or SEO spamming operation. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, and the document body was unreadable, but the heuristic firings strongly suggest a malicious intent related to link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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://vecsecity.info/editor_up/zisonuwowoba.pdf In PDF document text
    • http://csc020.com/userfiles/file/20210901120951_6jrb0u.pdfIn PDF document text
    • http://tornyanggrace.com/upload/file/60336319755.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46262445765.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210912145750.pdfIn PDF document text
    • http://kaies.net/upfiles/file/basuf.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/59e3220526af82c6f9f4b483854d8e45/pofunirilu.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/rizafolozitotazi.pdfIn PDF document text
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/90251221830.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/37498525280.pdfIn PDF document text
    • https://best-label.com/upload/files/sozewevumituguretulum.pdfIn PDF document text
    • https://thepainter.asia/upload/files/71453041218.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb27a45359---nozupimewupape.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137c9268054b---50335920779.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/78378343162.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/48950296401.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/xelud.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/domipofimenulebudor.pdfIn PDF document text
    • http://clerus.hu/files/file/35112972763.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/0abc9f2e65bd7b25c86a5a8d525d590a/15704899770.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/99334521078.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/71131114404.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/61805426590.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/bf6e247caed3c97b66170f51cd1611f7/vigoga.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/pizoriderenusowe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=secret+neighbour+game+download+for+androidPDF 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_off0000f108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF108 17304 bytes
SHA-256: 660dea89ddc91b99d7ca802e47d2d98314d3a5d8d8ac360f7235eee114213968
font_01_sfnt_off00011e6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6F 11156 bytes
SHA-256: 3d8f706067b0bc0dfaba71a8abf212fa9715fd55656d2e31fb4136b3be719a93
font_02_sfnt_off00013824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13824 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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