Malicious PDF — malware analysis report

Static analysis result for SHA-256 acca60003dc6129a…

MALICIOUS

PDF

91.9 KB Created: 2021-07-15 12:23:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a2ad1ccd666c026002b1e6fe359a56aa SHA-1: e3e3e2022ecabc5e9ead673bfda1ef36290c2246 SHA-256: acca60003dc6129ad9cc326898b50b0e25f8b14f8703188fe8bc2e9e3c3320b6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document functions as a link farm, directing users to numerous external websites, many of which are hosted on compromised CMS uploads. The ML classifier strongly indicated maliciousness, and the presence of multiple URLs, including one with a 'utm_term' parameter suggesting tracking, points towards a phishing or malware distribution attempt. No scripts were extracted, but the overall structure and URL distribution suggest an attempt to leverage SEO poisoning or similar techniques to drive traffic to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://pistant.ru/uplcv?utm_term=football+streaming+service+free PDF link annotation
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160af9784df4ed---46692256566.pdfIn PDF document text
    • http://ucity69.com/clients/861769/File/90889479352.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16089eeeef22e6---41402435108.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210709094601_ng2tzu.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/48858748137.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ae5e5cc7d---dozavagiji.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/69762740253.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/wevasuf.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f53b181b45---wirogotikabifojapoxudokun.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/13997027958.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e7c54db00---52834020869.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c876a2bfe10---woxizibezukowimifibo.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/256c008cb083276ae6c45677daf3b719/xivuwuxivi.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606e20f2abe64---nudogi.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160acf429eb5b4---71072045327.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607219244b3ab---41130611314.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608257d4ab534---8992108176.pdfIn PDF document text
    • http://splogservice.ru/content/file/safurinu.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/jkmd1kqdpn456uv2feg5edmm16/wamur.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b13c2dd2a7f---gokefupofepegipopizuzumox.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb8652c547---dupilevimamivoguvukivapu.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/bivositifamebevedo.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c209e41e81d---11925714438.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/a29e3893fb376b8363c20918a4c37c12/xitisumonupaseluzepoz.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/damatolape.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/nsfspqqjm1eas9qsholhsdh82n/lakelajof.pdfIn 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_off0001038b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA2 10864 bytes
SHA-256: 35ce8e407a18c9c476611516cfe22d7b48d222b9326d1e2597fa6a9796742ccf
font_02_sfnt_off000134cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134CB 17336 bytes
SHA-256: 05ffdd3217438013c74357fa3186a02052ac6af70eac3ac94500dbf798053df3

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