Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdb384c212304137…

MALICIOUS

PDF

85.1 KB Created: 2021-06-25 21:35:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aadcb14fab9e5b1342a3d60f2d5049ef SHA-1: fff56f22d6f89c6c31b29caf491f04519fac6880 SHA-256: cdb384c212304137e1013a98ad83b52dcbabeebf44cf7810e7c8d786ea040c42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting it's used to redirect users to malicious content or phishing pages. The PDF structure itself appears to be a lure, leveraging compromised infrastructure to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b98ac0347db---31534093546.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/84ee19bd31986112d8ba3a4cee5a70e0/liwapusonijutosukojedot.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607046377daba---tuvojadopavoxutapedi.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/c5125a2d7700158ef61f9dc0fdab1b99/29569649366.pdf
    • https://dycmc.com/DATA/upload/files/202106131405453377.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160974d3e3e6ae---33144636098.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160700a63a2fb0---dulag.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc853ed318---13328016734.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cae2d461e8c---84879211198.pdf
    • http://snap-drone.com/userfiles/file/61636184946.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/id1noahta6pea9ucnlqpf6i807/80480190334.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3bcae5c2d---sopavoteketobanalo.pdf
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/tca4nnk3n87qsrlse22qgvdrn4/93021274866.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/dj8006s8gtrugphk8rloudfck0/letenirovudikajizakola.pdf
    • http://biomassasia.net/data_ed/userfiles/file/gajorez.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c6990c370c2---56642682649.pdf
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814acd38669---jukuxunemusodujozetivirir.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/67027a043caeff4a55ab956548733b47/relejiwojez.pdf
    • http://envigest.cz/upload/file/xupubumig.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607155944e322---51057995824.pdf
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819fba4aa1f---1418426591.pdf
    • http://montgomery71.com/clients/34132/File/lipipudobusema.pdf
    • http://bright-mineral.com/uploadfile/file/2021052204122044.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=strait+between+iceland+and+greenland
    • 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_off0000dc5d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5D 16792 bytes
font_01_sfnt_off0000f474.bin
5e79648ae89f82577b6c6396269ffd272e4ea8b4f0b2728e7ab24dd7b6ee39b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF474 10556 bytes
font_02_sfnt_off00010c7a.bin
c81569fb38be162a8d454d9eaf0984b5a275e30b2ef777ba5df478e4ea8e0e39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7A 23728 bytes

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