Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce9f6a40bc5dbc36…

MALICIOUS

PDF

86.0 KB Created: 2021-09-06 20:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2375f3e4a5c798eba75b007b6ec1f550 SHA-1: 04e06bb452082b4aee06399b44591f4264b239a3 SHA-256: ce9f6a40bc5dbc36a43a892e7939e36467664c374daff750a72a7424714f2056
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to potentially compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the PDF's structure strongly suggest it's used as a lure, likely for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://chieusangducphat.com/uploads/userfiles/file/datonat.pdf In PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/909715bab96b5ffe81f53cb9a14a33b1/28055711969.pdfIn PDF document text
    • http://bio86.fr/fichiers/78770681427.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608033ad66257---32602493220.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b82a03ae523---nawuj.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d22f21e31---21043892154.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/12efadaa5a4087b681dab8c34fbbb41b/tesegevituzujuxigekegin.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770e9e342fd---22173935180.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/61215788878.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/jipakig.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/76630763346.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/85519713805.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16110fc0f0ea7b---82982368738.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/1223360197.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c32d97c00---fufebetivusujak.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/benawizewowige.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/sekawogosekobenazu.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a5dbf25c689---73544213884.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/q1qrp3vcg5prmu1df97i0mhrms/dokonamasuwumanobaza.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/zasuletejolobep.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/glfkqrb8tgijpjrif5daibedq6/fudimod.pdfIn PDF document text
    • http://kuppersbusch-center.ru/uploads/files/wujomalupoki.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160983318c53e6---38979650216.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/97636179105.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160fe12ccc35a3---perusofutodadekopafak.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/61516035918.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=changer+ordre+page+pdf+en+lignePDF 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_off0000e7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB9 19944 bytes
SHA-256: 5bf88cd101e08546b92feaf6d24f965585c1fd68f94a82f12e21627f130bfc46
font_02_sfnt_off00013204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13204 10540 bytes
SHA-256: f8d68d4ceb7314e211230f24e81adff27fbcd78bede0b55fdb86dda8bc4e43d4

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