Malicious PDF — malware analysis report

Static analysis result for SHA-256 437052a0dd37d2cb…

MALICIOUS

PDF

89.1 KB Created: 2021-06-29 19:43:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c0ed3188da56c59bf81030a1aa845872 SHA-1: 6788a6b784ddfabe9b4b566fe621d871c66bf18a SHA-256: 437052a0dd37d2cb8ee39f0f0f23f89fd205b18866ff10bb2ab2f3da1960b482
96 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, and the document body was unreadable, so the analysis relies on the PDF structure and embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://houstontca.org/Content/uploads/files/milorivomekosuromutugeba.pdf In PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16085279826f78---75293401963.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3d833f8aa---52726433225.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/ba8205059b5fbbdd6d76c9c2ed8a47c1/ritajidemore.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/lodasevakonadoremonob.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b26260d86e1---17292092762.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d962dd311de---dodabowejuruminoxenorew.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/88377034247.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075693be8166---favopodinujojonubulel.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/12367100704.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/78781915422.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/tozadugisaz.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/xafebo.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8b4300825---kepuwekaxokupu.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/c319cdc7dbe9e7678c885c735529abbb/baguromagixujoxobibized.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/tumix.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/votuk.pdfIn PDF document text
    • https://melz-feu.ru/upload/78698025084.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/tisojedebas.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/75471182311.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/katavinemuzexosepado.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/140ca52a468d39bfebc169303506e7d1/8576755701.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/202162172921.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/26c2e842a3d52aab2671db38542208ce/deroluku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=bfr+training+before+and+afterPDF 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_off0000f99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B2 10508 bytes
SHA-256: 0f870933c5cd3115aaae8b1b7f9a56d943b44d85c16c3fe91bf932db1e41d4ec
font_02_sfnt_off00012983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12983 17100 bytes
SHA-256: 3e883939677a959a826c7eea77f45a10135a8ab951628b7f91d11a2824d703b0

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