Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f178a31604d5863…

MALICIOUS

PDF

74.8 KB Created: 2021-06-28 10:26:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f6e9ef4974904a5b45d558b398aa443c SHA-1: 04bd1dbc37b9dc4adbd4282849a0a572886b5731 SHA-256: 8f178a31604d5863d1104eccbf72ec73a5c20f23e17a4f021a8f0fee0e09fd09
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards exploitation and potential phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ltssinternational.com/res/wysiwyg/file/bunewamo.pdf
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/1ef8cd3ce4a72917301938ea8922b54f/29038853990.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b18dd2439---43975560874.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606caf649935e---66205865176.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/m7ikkf6vdidibkc6h1j7ql286u/42872077807.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/0c91d3d2e4c4290e27ed6abdd5a9e534/vatidivefexonugujo.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/fb29ff1cb71e6a7db004e19f130dc156/98281890692.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855d3be2345---javoxepita.pdf
    • https://fibaquitaine.fr/cebatrama/userfiles/files/wobogirato.pdf
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/maq7j4j2m6e9fh690m6n9nebm3/tinitigonakokisezunum.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bf6ba24fa61---94330222658.pdf
    • http://phantasos.org/userfiles/file/97355218997.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be2ee8958c9---tobikuduteputen.pdf
    • http://jejuecotech.com/ckupload/files/45917986266.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/o1ljpm4ab6b8rc4qud3boi5pom/14131235821.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/60222ca4e9689526b9c6e9d26b062577/79084816613.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/a2090390d95b9e610ab0151735508d59/1383401767.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/ml0rshm3e2ehi4n0esppac8k6a/vefamozupipib.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/41a5dcd1d3ab5db9cac873f4be41de53/zixeditodilugapo.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088179b0bb44---rabidazalofib.pdf
    • http://ithalattagarantibelgesi.com/resimlerfiles/60414690330.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/88d79be9c4b1df2201197d399fafbc31/80884655056.pdf
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/6986525334.pdf
    • http://klhl.com/userfiles/file/35038846.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609b42e8d315f---50728234397.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=typhoid+causative+microorganism+is
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c275.bin
9e23c70f5facb8a86baf3493da972e9c0cb49d50dc1b662f7ec568048e874616
pdf-font-stream PDF embedded font (sfnt) at offset 0xC275 15448 bytes
font_01_sfnt_off0000ea38.bin
9d9a39155d0198bfd8602bc65ac447cf9f8758ff2791e0aa5964213efbcc69ce
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA38 11160 bytes
font_02_sfnt_off00010409.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10409 16792 bytes