Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab442a534cf3a9a9…

MALICIOUS

PDF

83.1 KB Created: 2021-09-05 20:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 2e5c9fafc4f8e9f6a797e565eced6007 SHA-1: f63888dbff70c040df1d9d6412c94baad810c39d SHA-256: ab442a534cf3a9a9854b85a9751c7c0435f95c6038e6b965e5e3d7c9d91d403c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/2887bebb7f884c9939880c1abadef27b/lareradunekepax.pdf In PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/1100170637.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b37f145e20---31225039662.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/76055855755.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/93425318859.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/tag25na7djbhe085bpg5qunu90/42384666155.pdfIn PDF document text
    • https://coop-alternatives.fr/images/images/luzifudiwoniwatovo.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/be36dcadf28b9d39f7835fdebbc5ecbe/lasijavevotulesusaxekijan.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160f8ffdc9c691---zapetumemesitozagotoso.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/gl32h63n1m3aigg25fo38qjc5r/96328783541.pdfIn PDF document text
    • http://tlproduct.com/userfiles/file/netogopomawimexe.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/73021155992.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/suvudabifik.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/widazukukudesivi.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a16367e260---zimetamira.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/8049186827.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/25328220555.pdfIn PDF document text
    • http://rcsiprojectracker.com/userfiles/files/13004676122.pdfIn PDF document text
    • https://digireg.it/upload/64173882301.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/a8b7645bab9d9f84a484ccb9ea4f8b8a/sapoxifi.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/4169581842.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/febebawaso.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/34138585847.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/a2l74ks53sgf471mal5ac6kfk6/66242880774.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/65552989907.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/vufexoxosixodatab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=sheria+ya+ajira+na+mahusiano+kazini+ya+mwaka+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_off0000e2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A6 15688 bytes
SHA-256: 2b89ee7fec329ce36be11f5e2e63175a65259f97edf88d20da3d7949273d4556
font_01_sfnt_off00010ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F7 11596 bytes
SHA-256: 44beff218dd6f6adce9a2e79384aaa94e5c6d57e5a905e08431433607b4845a2