Malicious PDF — malware analysis report

Static analysis result for SHA-256 49dbad8502e7c1ba…

MALICIOUS

PDF

83.2 KB Created: 2021-09-06 00:10:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: e1004f28f031f74a5863c1dee7f24f54 SHA-1: 32769cfab08f5242932378e46e16da2d6ddb8041 SHA-256: 49dbad8502e7c1ba7a8ace4a0fa890fd834c3dbaa8e273b973d8086d803c7862
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a link farm with numerous URLs pointing to potentially compromised CMS upload directories, suggesting a tactic to distribute further malware or phishing content. While no scripts were directly extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

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://liburnia.pl/userfiles/file/38467745228.pdf In PDF document text
    • https://a2designbg.com/userfiles/file/68596825301.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/nilogodemevukisinuwolite.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/p2rkfdl046ju6al79bei2he1m5/bejaxalit.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16088cc51048f0---zuwavabajupus.pdfIn PDF document text
    • http://faradbox.pl/files/file/93958858371.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075f19697a42---kenixawupasodukipi.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce7c5cb4d8---94060768573.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/4ae93fa61b2fe9bdd44aa7a82406d20b/pefiposulotowilesog.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/putowadegaxorakofobisavix.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/pifofixo.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/nolezugosimozeso.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab39a5ec07---41101689904.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/88535504200.pdfIn PDF document text
    • http://rokakisreunion.com/clients/a/a8/a85ca1e4cfc2bb88d767af442173b437/File/wapakawotivuwijikadexax.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/5a7746cb9b467242c25970dd98de9068/81162046400.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/4913a683bc93b9f113489363c7efa710/pisimi.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/26af01ad28bd91900541e1154b3a3070/wimavi.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/2aa0a42cc2113ec228fcf6cf7060d9c5/mulelotoxuzixuw.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/52166559511.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160784881d732d---wadorominapij.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/21124597779.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/tenopuzexajej.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/rezawajuzifodoxoragixu.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/dvncpnm32j64lue76ug2p3uv34/77936084356.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/jomupavesut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=mecanismos+de+patogenicidad+pdfPDF 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_off0000d95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95A 10812 bytes
SHA-256: 0b157f22ffbb50fe036331d6c9b7daa4be28a0467c03fd0bc1debd9d537cc3e0
font_01_sfnt_off0000f215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF215 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A27 19952 bytes
SHA-256: 2dc5d71feeab89dc70c485b53b980c9de5cf952d71f8d67fa5b16bf7c0a6658d

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