Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed9fc0de6f33cb0a…

MALICIOUS

PDF

83.4 KB Created: 2021-09-05 15:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 08d830edde1a48488e0351880628594b SHA-1: ed892c3b4405d6a7036715894b8a4dd0975cc728 SHA-256: ed9fc0de6f33cb0a127b3e0d94d6558618ce291a2e26625696eb3da100d0471c
96 Risk Score

Malware Insights

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

The PDF file was flagged by an ML classifier as malicious. It contains numerous links, many of which point to compromised WordPress sites and are structured as a link farm. These links likely lead to phishing pages or malware downloads, indicating a malicious intent to lure users to external resources. The document body is unreadable, but the heuristic firings strongly suggest a link-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cdce2fe3e---94753918213.pdf In PDF document text
    • https://campermagazine.tv/public/file/9467845055.pdfIn PDF document text
    • http://ocean-ex.com/images/blog//file/wudin.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/4ec0a5e9d230624544642bd2ad97e731/podegetotawebigunonutu.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/xelavisejakirimixir.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160832c7cb3812---zefozaduviz.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d74eba2ff1---dapanisagarij.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/zafarobip.pdfIn PDF document text
    • http://statewideroadservices.com/clients/879378/File/32676082127.pdfIn PDF document text
    • http://goref.ru/files/file/dumigik.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/rexivovetuw.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0e86cdcbc---77499308566.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/6888a3mjeh2lgf1le9ssrm8qvu/21094834531.pdfIn PDF document text
    • https://simbhaolipower.com/images/file/99084919465.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/5632719585.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/ziwemurazetapataparuve.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/c5hbgdt3q0h56541l3p2elus63/tituronafupanimojepifa.pdfIn PDF document text
    • http://springbook.no/files/tatupojexukegawutivozok.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/fonedapamasazugen.pdfIn PDF document text
    • https://kristinanamaste.eu/files/22678292761.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/jemiruge.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/4857c08c5d86227aa6495b802948dc24/laridif.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/vedujojozulixukijomo.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/gefeditudofapas.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16080cf4985186---67941235471.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=misra+c+2004+pdfPDF 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_off0000e304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE304 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1B 10428 bytes
SHA-256: 7b4c68d37d82f2c0a5f974fcbd9b9e7759002493143863b5cf13d3e1454596c3
font_02_sfnt_off000112eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EB 17492 bytes
SHA-256: 93dada27cee1f039b43a09245971615bc3fb9d3be53d8e82ed6aecf104674d12