Malicious PDF — malware analysis report

Static analysis result for SHA-256 378581c66aaef4cd…

MALICIOUS

PDF

72.3 KB Created: 2021-06-10 12:44:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 5705b7b49bbd312eec69f9bb998c4c4a SHA-1: 019c7649b0f4f0ffb46d7eb4ecc8e18c1f2c5a62 SHA-256: 378581c66aaef4cdb6ecc3da9c94a3a81d104a1e4e384fc5991595776907b5ef
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to compromised websites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple distinct hosts and disposable hosting patterns further supports this assessment. No scripts were extracted, but the primary attack pattern involves directing users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://cructi.ru/uplcv?utm_term=zettili+solutions+pdf PDF link annotation
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcffa2a81b---24546640407.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/252tlabd4ktco3r04e0g4aubot/1518363802.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/c276c78ccdadec6d59a4f9e7e72b7b3a/feguginojozufuj.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/95580152363.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095bee49e82d---kenofeput.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/56714240242.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c75f6c9385---78572383350.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609406c410c9b---20508503059.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/8636f43360deed0d2b90302a12a14671/kekuxowufitagonutowewi.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/42190068125.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9ce60d857---75175692753.pdfIn PDF document text
    • https://jetaime-shop.com/files/12376069602.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/24450318504.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089b39c1a00b---43543533178.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a38fedb4e66---rabigalex.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a915a06a1dc---lefoxadebutipes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD7 4684 bytes
SHA-256: 25d5614fab6c040774bc9c229ec29286e1e4a1081e0b7f34c388ffa190ff8885
font_01_sfnt_off0000efe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE2 10780 bytes
SHA-256: 3450bbcdee6434997c78428fcde413a2dd923e3774fb5473d8757d0656bd8536