Malicious PDF — malware analysis report

Static analysis result for SHA-256 603e45d1aa64a2b8…

MALICIOUS

PDF

87.9 KB Created: 2021-06-30 20:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 17e0704dde37c5cf33bf495478c6cffc SHA-1: c7a4951f83a3c6bdc1905be6738d798d1497ad2f SHA-256: 603e45d1aa64a2b80d71bab23097e0117de3dcd165fd2422e45f6b3495442352
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://nhasachnguyenvancu.com/Images_upload/files/75280499630.pdf In PDF document text
    • https://najarshi.com/basefile/najarshicom/files/25682671490.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/kolufudemawod.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/936e0d84afad5a051918f7a424c68410/lepumogoj.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/s43piugsvc2fvh4fpnjg67tbp6/27564483487.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/66d5a4da230c7cf7505600a8b95c58a3/gasebutuzunilagibo.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1bd85ab13---70009687875.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607119aec3e47---32413981154.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac53c04d909---87908359456.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/fisaxo.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/kaxiwumasososinuv.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/letalapulisemakivuxixapi.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/eeibb9i5hup8a5ruq5jqr9cdb4/99342620715.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/i85m8c67mltsba6v3dvrsedldr/36616968960.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/rovejizilepipelarag.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/l4m7oe2433f9f5shta21g6j28q/tojobumadetena.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/fc1fbf3b5eb0c61d7181801f8c3c6bb5/damezenujamerip.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/pvhpi67au9ph5le79uj06c6j73/wugafiregi.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/ea6428b982678881bcd24f98d41e154f/58101936300.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/eedc74cadc3f38e01333464cedf98eaf/77641077536.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/vuvuwogifaj.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/dna0nq5qbdplf595d8v2fo6tr4/zajipevetozukelifewadezu.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/fec24335180a60a5a89accbde520de34/tetidobaso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=pre+and+post+test+questionnairePDF 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_off0000f5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D1 10584 bytes
SHA-256: e1ec8f9bad777dab655b22ee9b930c67f8882fcc3d7ed6d5c16921bdc75f7bbf
font_01_sfnt_off00010dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD9 17048 bytes
SHA-256: 4e14d0a5a9f48ebe99dbc01c9f7ee7e23f04d4155eb13d865c4c5fbeabe9a915
font_02_sfnt_off00013a2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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