Malicious PDF — malware analysis report

Static analysis result for SHA-256 25d6e1a29435ac33…

MALICIOUS

PDF

83.8 KB Created: 2021-07-03 08:18:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 368663492ab2d77320438c2964a43e84 SHA-1: 659b8904309c393e49653531ed08bc5438631f8d SHA-256: 25d6e1a29435ac3303c1850e8365b1be4139a8089f2547d5c735c94f18b60615
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of numerous links to potentially compromised websites and disposable hosting suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and link farm indicate an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/pujunidirodumu.pdf In PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3d2f24a7c---titerakobofimegod.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607335b8250b8---60445653508.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077e6157a95e---50395752959.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/7aa3c36b8cd08af3ffdff57926bc7baa/joximesabarefexo.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/fiwozafuxewozedodi.pdfIn PDF document text
    • http://theettiaresottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/kanumagobojugolebafore.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/lezapikuxibamajobuk.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831b8b5127a---xidupebavujesiluzigimare.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/179b73a7698ffa37a81b8595071286c5/20681661232.pdfIn PDF document text
    • http://sun-eko.eu/files/file/dozasafanivovogilef.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607072cacdab3---53488823263.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/kipivusel.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1609138a870178---lupasawixikil.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/88025389435.pdfIn PDF document text
    • https://argumentua.com/i/file/45247409929.pdfIn PDF document text
    • https://computerzone.pk/file/67189966477.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609409a79f974---3987738218.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/5604c87b9f3f7dc6b6bf9904d5eb3107/zefatarizawaketuvenarib.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/51817875551.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/ohjlf29vlnj4e9p1d4083k1kg0/55874022865.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/zozinokilutonu.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160a2114d8046f---59495827953.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/91112886817.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=magnesium+chemical+structurePDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/2f79850d40610901dabb309c6ebf0aed/32026626899.pdfIn PDF document text
    • 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_off0000e5a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A2 16848 bytes
SHA-256: f4b2f06bf9f44b5886abf08140a18a88b8124c9df56dcc9f260882b5473fc419
font_01_sfnt_off000111c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129DA 10652 bytes
SHA-256: ba7f98e47948c12a7552ec8f27564755d6b8038fed79f7ffd687891b3b667c64