Malicious PDF — malware analysis report

Static analysis result for SHA-256 36097b2e179b0f6c…

MALICIOUS

PDF

76.8 KB Created: 2021-09-05 23:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: db31f0b9360604cc0b95f93814c571f6 SHA-1: 5498fe6e497be51838f21493012f930b55514c0d SHA-256: 36097b2e179b0f6c574475315b3baf7cc69aab682372aa975045156ec2ec7bc9
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link farm attack pattern. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/bb791e3e6ff8b609aad8414a471fa880/wefililad.pdf In PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95888641015.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/wabupek.pdfIn PDF document text
    • http://ksmt.edu.np/assets/ckfinder/userfiles/files/bulasakufaberalomudepugo.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612144d6d537c---nenuwumepuj.pdfIn PDF document text
    • http://barnesfamilyre-union.com/clients/52050/File/gazugubopuzuduzexa.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/ruwafiwilileduwapaje.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/joxiriwijidejegegidub.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/70652923202.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/nulafepobaviroredamu.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b49798168---58628449701.pdfIn PDF document text
    • https://kraftyz.in/ckfinder/userfiles/files/61144256106.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130532334e1f---86312888097.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a509bbb38d9---84062481418.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/xewogoxuludodili.pdfIn PDF document text
    • http://1984wnhs.com/clients/2/25/250e0aaa51dad033202e6c34d8602b4d/File/zumabifexovamap.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612195145d875---wokugelalijalaxuto.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/87155564832.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/bojive.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/vikovelekidorevikuwa.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b686a8346---50789104987.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160d06f71a9236---1933072808.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfe599f649---86012446030.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/kapiz.pdfIn PDF document text
    • http://jump360.co/upload/files/20210813082758.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=pwm+30a+solar+charge+controller+manualPDF 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_off0000c4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F8 11064 bytes
SHA-256: 34fa324ded8a92f956f6d35cfb2aa8a047720a466c8091d28bcca4537365a05a
font_01_sfnt_off0000deb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB3 17512 bytes
SHA-256: 684fcb06d3f0239ca4896b0052a3ef5c4158aa62f148aab764fe956ebb1d62d2
font_02_sfnt_off00010baa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.