Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ec386c9ec32d83c…

MALICIOUS

PDF

101.2 KB Created: 2021-07-28 05:28:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 55ab965341e4f6667627a4478145cda9 SHA-1: d396ee36ec52294532ff055fd4639bc679cb81e7 SHA-256: 9ec386c9ec32d83c808107191c3d0ed24fcf79eda6112f90edc1d3681b331c9b
96 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which appear to be compromised CMS uploads. The ML classifier also flagged this PDF as malicious. The primary function seems to be acting as a link farm, potentially for SEO manipulation or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://ecofincas.net/ckfinder/userfiles/files/fowumapafo.pdf In PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b25b50255---16713218052.pdfIn PDF document text
    • http://sireny.net/share/files/dabivujeribimizu.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/b26bf6d3j34ifkn89f6036h8k3/58289410145.pdfIn PDF document text
    • http://hersheyhigh1981.com/clients/37302/File/45225510476.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/c655182536bc921865fbcfbd81abe9f1/dujisawepixaribelisewep.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/koxopamijelumuwigedarafu.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/6b86763ac0f503e5ee5ce12fa0288917/toduxekoxukixir.pdfIn PDF document text
    • http://newworldss.com/uploads/file/74119598018.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/c30e042ba138ec7e61fa6187403f7aa9/xumisajisiwabaf.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/tubusegokurov.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/4697040509.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/xasax.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903d9d45d2b---memuxuzexisuzixer.pdfIn PDF document text
    • https://examonline.org/examonline/userfiles/file/78768522410.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/9519711290.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16099ccc3ce656---5332047124.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/30124771858.pdfIn PDF document text
    • http://valeneighbors.com/userimages/36877077035.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/68866587623.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4370f8cbe0---fupetokulusojuviremo.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7ae94c8fc---kokukotug.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608577f6b9b36---15831693156.pdfIn PDF document text
    • http://mp-journal.com/media/file/rakumametubukase.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=penguin+hidden+message+worksheet+answersPDF 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_off000125ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013dff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DFF 18252 bytes
SHA-256: 306108d0e5941bd71a36a5b9eb8bcc9d8ae4e3ec6314df8d125165b0ceaa43af
font_02_sfnt_off00016dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DC7 10928 bytes
SHA-256: 50abc21683f30ca9d3870c53d3240cbae246139eebad3fadc8044b6d809beb8f