Malicious PDF — malware analysis report

Static analysis result for SHA-256 a685d85229e442c8…

MALICIOUS

PDF

94.0 KB Created: 2021-08-18 17:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 110edc18e19a1393b9853858e72f5ad1 SHA-1: f1c6f1f15b039ebc14fca31f396fa8c017740d06 SHA-256: a685d85229e442c8d75267e131b8eecbfc0a28dc6c166d7ee8854333f8c2e37f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress sites and disposable hosting, indicating an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9673

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160734ec5799f3---99548832171.pdf In PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fedbd06cba---zokanogigumoperakikizosa.pdfIn PDF document text
    • https://promise-land.com/upload/file/kirowekeda.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/66516588476.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/tokadurebejejudemozi.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/vizonu.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/87832440381.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e2f331789---kexovufozazowifakev.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f7bf010ad4e---97941055660.pdfIn PDF document text
    • https://italvaping.com/file/31875698414.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210529131724.pdfIn PDF document text
    • http://yilip.net/userData/board/file/35774153404.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/59392104818.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/dubotigazevemetadosama.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/35346243209.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/meravosiku.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1970785a18---47167615329.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/lexidiwupowiwavidefowi.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/62410500740.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/e7a5a4392c5c8546ab3d5f8be8e032a8/13877051571.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/f2ols10ehb258u6grm3ekrvaf8/zolobopu.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/26023020933.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/14230429779.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/wazaga.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ea8b8c4dc---suluponesopurijo.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/71120840665.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/40dc7c5c07c53bee35043e6bd1151922/xoduwufudaju.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/zaxukijuduzisenametosud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=bee+swarm+simulator+wiki+science+bear+questsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B4 17148 bytes
SHA-256: a82672ef00e8ca36bf6d3c4fb69180f3a4177c11b375fdd8e615ab4b8c404822
font_01_sfnt_off0001167c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167C 20212 bytes
SHA-256: a5fac98a75344465b221046059401442a080599cc45d3144b7d504c0987c7f06
font_02_sfnt_off000135eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135EB 11008 bytes
SHA-256: ff8ba903e37c6f3112132367c5f7dc95c9383be234e37963803c9886decdc2f1
font_03_sfnt_off00014fa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1