Malicious PDF — malware analysis report

Static analysis result for SHA-256 533cfdeb7edf26c7…

MALICIOUS

PDF

83.4 KB Created: 2021-09-04 07:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 33672ab0c3b08d62b065b28d960130fe SHA-1: a0952e125916696cbf0d0cc252e1095718eb982f SHA-256: 533cfdeb7edf26c7489fd542c8bbfc5fbc6fc288951dfb6dd0f4abdbac348785
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to various domains, some of which appear to be compromised CMS upload directories. The presence of multiple external URIs and the link farm structure suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cailux.lu/userfiles/files/wudamutelojunewo.pdf In PDF document text
    • http://diysmart.net/userfiles/file/7789132861.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/30657465757.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/88948560854.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bba1db639d---89993177488.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/87775547467.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/25667841938.pdfIn PDF document text
    • https://vieclamxaydung24h.com/upload/files/gebomugez.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/guzixogiwefuxakofekotojo.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/55111402139.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/3590ba6545bc54a81972425fe8c18f8d/49340861162.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/jatekubatoxanosilo.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/nosuwavigik.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/990cb5196a062cd227b4c63989113ead/96808247287.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/f9694vmmo88nmb9vdptgfkultb/1168016284.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/c7012b759de553c3535ce7bb25e5390e/28962803028.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/67493992122.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160fea0e5c0393---kubakasasikotisamewuv.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e54a45040e---86205352909.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080bc0b1c53e---mafaxisok.pdfIn PDF document text
    • https://andrejc.si/files/file/85904547247.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a01181042b7---nitererivonukujalakajurif.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e08f18bbb0a---foxusema.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=excel+vba+pdf+drucken+dateinamePDF link annotation
    • https://youtu.be/taeu1rpisbgIn 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_off0000da16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF228 20592 bytes
SHA-256: 9b3485c7d5bc0594bf2bf414351d9f1a174061d674bbb101b7f86f3e6502fde0
font_02_sfnt_off0001255e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255E 10976 bytes
SHA-256: 0fd89782c58636653e3ef09dce9e32777c610a4296157bea7b8a098d29b5e9ce

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