Malicious PDF — malware analysis report

Static analysis result for SHA-256 8821006f7840c99c…

MALICIOUS

PDF

70.4 KB Created: 2021-09-29 11:31:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 61758f0ee02dedd2f2b3413dcc79dd5e SHA-1: b917844dd877e8edfe321919a3b76d4b9c93d68e SHA-256: 8821006f7840c99c2c4e17acacdbb70dc497a62fe53e6115c68efbbf0f78d1bb
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URL analysis confirm a link farm pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pixomot.ru/uplcv?utm_term=create+pdf+on+android PDF link annotation
    • http://milwaukee.center/userfiles/file/mibimuxolifizotefof.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/ulvf0r97qr37v7cufdb286vqep/23270856502.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/jinosefaguxisuliguxaz.pdfIn PDF document text
    • https://shturnev.com/files/foFKED/file/zejotoxusaletibawolama.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1615355e156158---11794965180.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46792824228.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/tetaxoronosimafepizu.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/25469758532.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161530f2452e8a---binozabavafarewele.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/27604191844.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16135f24841a37---38532368317.pdfIn PDF document text
    • https://umartravel.com/files/20532321001.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8a09b2ac0---52052709797.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/zidedovitipe.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/xirulixegegusewovafapim.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/rowitogomifulejowo.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/52851029210.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/87374187627.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/ditasanif.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/manunanimomugebirusubif.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb84990340---90211535395.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/be9adb04ba090aaa8458aea6b2aa2145/21889853590.pdfIn PDF document text
    • http://euphoriaclub.fun4two.pl/uploads/assets/file/4193427726.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/suzul.pdfIn PDF document text
    • 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_off0000b42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB42F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC41 15780 bytes
SHA-256: d5bfd6b02974c13c63a895dd4265798fd5d0d4fc33e77d732df2d243e26f27e6
font_02_sfnt_off0000f463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF463 10308 bytes
SHA-256: b645f1768ed2e893dc41f18dfe2e4ee02a5d40a557c63bb43251e699440dfd0a

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