Malicious PDF — malware analysis report

Static analysis result for SHA-256 377200c7c62a1b2e…

MALICIOUS

PDF

82.9 KB Created: 2021-09-17 19:29:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: fcf2bfe3e4742fe557a230f1db4f28e5 SHA-1: 4324ae49a6a9b1b4b33a5fab593b5fd4d1745aa2 SHA-256: 377200c7c62a1b2ea5a497b694a849cb13de276e62311a810a34bee61aa16f3b
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to files hosted on compromised CMS upload directories or disposable hosting. The ML classifier strongly indicates maliciousness, and the structure suggests a link farm designed to redirect users to potentially malicious content. No scripts were extracted, but the overall pattern is consistent with a phishing or malware distribution lure.

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://peterpan1996.it/userfiles/files/satudafofa.pdf In PDF document text
    • http://scarpatti.com/files/60601864240.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/0576b4656fc4c5219c8ee3f2c778f5f8/vepepimuril.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/2a76189442f88b4676c8aa07a8f89217/jarafokiwumek.pdfIn PDF document text
    • http://kyea.org/imageuploads/zuwuz.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613249dadf4ef---45285116930.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/kegemejuvitela.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/69455935164.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/gusetakeg.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/75563514045.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/77203984765.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/15767779744.pdfIn PDF document text
    • https://actorconseil.com/files/file/wamorifejimub.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133f04b30b71---69469629704.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/mipuregudoxitejolulej.pdfIn PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/22509295836.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/9746069281.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/kozaliwawafuditefe.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/23196370.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/75489814089.pdfIn PDF document text
    • http://runwellconsulting.eu/file/file/46261016738.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/84120781795.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/hleaqtpu7msqglr85gkb1o1n50/wowenisubomamabuwukuga.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/31615641138.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=windows+7+multi+language+isoPDF 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_off0000deb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB7 18132 bytes
SHA-256: 89ccf7e065f5cd6045d9fe1d68b6b6b0b1ed16fd12bf9f643f4d62924e2f7c65
font_01_sfnt_off00010d17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D17 10720 bytes
SHA-256: e066f6cdfd41dda18d5220bfde48a9240ec6b409e6dea150b6428d6665758d3f
font_02_sfnt_off00012599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12599 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1