Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dceaa0bbc3109b5…

MALICIOUS

PDF

92.5 KB Created: 2021-06-28 15:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b2fb29ec8f76f993a6edd564db40b65f SHA-1: ace13686d1387fd42d6f032eaea10f2ad163480e SHA-256: 6dceaa0bbc3109b5afb5bc8a59d0843d612ab820738d9459b4d2de22751af555
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous external URIs pointing to various domains, some of which appear to be compromised WordPress installations. The primary purpose seems to be directing users to potentially malicious content or phishing sites, leveraging a technique consistent with spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://nomylo.ru/uplcv?utm_term=ucsd+library+room+reserve
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b1e034c5c---31991251924.pdf
    • http://mdbim.pl/ubezpiecz/obrazy/file/73733394939.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/8bd63402b55e2165b7d2e8f363419285/ketura.pdf
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tetezedorufasozagugiwusi.pdf
    • http://amctop.com/board_data/editor_img/file/202105082209.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a28c69a0---35837787640.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160cf5891d4b53---zukobonazelerewerinazof.pdf
    • http://malbreil.com/userfiles/file/dademekewabopusibuw.pdf
    • http://richiefamilyreunion.com/clients/7/7d/7d03816b951c94fc7c065ced7c7ccdcd/File/sigenoxeresijosowenis.pdf
    • http://sunarfactory.com/userfiles/files/55546558046.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ba02dcba4---zivax.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/d5pujgvlu7er9334q2tgi013ga/vibof.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d0848569b---86485815380.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609541d504387---12871764572.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/nf53a8bnb8ouvfa5k4mlg22vk8/12503513278.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/4ba541a7a3736c81d86432c396ddfdb6/61320977163.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7c8bcce55---rivafeleribetirap.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f28d3e9678---94005405654.pdf
    • http://bigband-ulm.de/userfiles/files/32507239870.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077dbe8f20de---53367915807.pdf
    • http://auapp.ch/userfiles/files/90425500513.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160820a26737e0---75880261990.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/sbprhru70t883uqnlnktpbkum4/jatetunejijitosozogur.pdf
    • http://tpdw.pl/userfiles/file/fawegijabodeluvejonawezo.pdf
    • 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_off00010649.bin
9c2e39ec1ddb085d49cab2981b9aa90e00b1a552585b437682ff5bde2e6b2771		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10649 10656 bytes
font_01_sfnt_off00011eb3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB3 16792 bytes
font_02_sfnt_off000136c5.bin
d622f075b99b30c07ef6ff7e65156787bd92cc34e230ac6d7aee8e821de636be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136C5 17584 bytes

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