Malicious PDF — malware analysis report

Static analysis result for SHA-256 30cb4dd7a797843c…

MALICIOUS

PDF

102.2 KB Created: 2021-07-08 07:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 66c082eeb9737277c4651e6053e51d1e SHA-1: 9c8399bbe8c2d63f6185a34260fec8456d1e52b0 SHA-256: 30cb4dd7a797843c320afe62dfe6a976cb8a8012428a4df11901df1163780e24
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites. The ML classifier strongly indicates maliciousness, and the heuristic firings suggest the PDF is designed to leverage compromised CMS uploads and disposable hosting for SEO or malicious redirection. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://przyklejki.pl/userfiles/fojezulorolulikawavifes.pdf In PDF document text
    • https://balaji-technology.com/userfiles/file/bonolodeda.pdfIn PDF document text
    • http://kokomo1986.com/clients/31029/File/mitivopivitexa.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f5fb33d7b---bizimigidomazoragijuliseg.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/xokajifelusogatenidawulo.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/89965539483.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/8vcgulsrbc2na8at8k1dibvl7r/90948393654.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160828689ea393---65974683665.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/23qb5q2goo6tnefro43o0gcb4c/60653243705.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/ebf00c75dfd93209cdbf656c44e4aece/24603131730.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c105305d139---fodiwaxeluwotorugofo.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082b805975d1---duladuzamasaxumovetosu.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5eda47f99b---xegafedamejuso.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/kobefojafog.pdfIn PDF document text
    • http://pvhs1980reunion.com/clients/e/e5/e5e9f74eb83211af097e98bf68d59c4c/File/besosagozupulojufi.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/bccv495g42s60kpofvd2g1soku/pivikozukivosiwopojali.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a972f128504---nazigerakaraxexabotu.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/lopik.pdfIn PDF document text
    • https://juegosinflablesarizona.com/files/banisedutiwefukobutiwo.pdfIn PDF document text
    • http://zxsolar.com/d/files/6289293285.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/dekudojoverawejagukixi.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/dff331defd6d3918a43e0530af92c230/womapojen.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd9034d012---zegobovivunefaledasewuzed.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075e27cc98c9---53537982672.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=pictures+of+animal+jamPDF 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_off00012ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000146d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146D2 10728 bytes
SHA-256: 0b8be24b9b9e220bb9cd228819906b344fb2014ba70c0c44c8f0e5037a28e496
font_02_sfnt_off00015f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F73 17040 bytes
SHA-256: c69d541a352083cbd12a7b9578109b4212d00c61622235e1fceb49c43d37289c