Malicious PDF — malware analysis report

Static analysis result for SHA-256 3503cd76122dd5e0…

MALICIOUS

PDF

91.0 KB Created: 2021-07-23 17:22:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 06651671188675a9009145527a8d90d0 SHA-1: 47157c9e70fce757dae4902aa21e3a9e5890bd3f SHA-256: 3503cd76122dd5e021aca5f39e287cdf57fcf95878becdba5b4613b85180fc8b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607780666e83c---jufapofivo.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160790c62e52fd---75878905606.pdf
    • http://mintaialuminum.com/d/files/41653879349.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b46e1ea24a---5073860809.pdf
    • http://masseydogs.com/clients/f/fc/fc2e217ffa4851e49ca3cd921a15cf41/File/1836012290.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/0c205fabe5a86b14c1848bfd21237ac6/tunuzabevuzojurifobojobe.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762833021cb---mipulufunufipom.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/dv3phm59nq9jquhf1loaqrd0f2/84578352172.pdf
    • https://autotronics.vn/userfiles/file/32000640874.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9392fd3d7f---rimezugofupewume.pdf
    • https://begili.com/uploads/image/files/66697893870.pdf
    • https://kisikana.hr/userfiles/file/11804584721.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160867dae04721---wutopixavasatixulavutokej.pdf
    • http://zabradli-znerezu.cz/userfiles/file/gabilira.pdf
    • http://daimarconstrucciones.com/images/admin/file/popojonovow.pdf
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/43861534057.pdf
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/e2e98aaa427697b87f387c8224f12f00/pilevadegafufot.pdf
    • http://thelewisfamilyreunion.com/clients/c/ce/ce72a6ed4f7059d305e3bbfb121cee90/File/21315837595.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/16e35b3e1a5fb04d9acf3d3720d49f7b/retuxowomosoman.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087717302a50---zamukodeses.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2c250d71d4a34958cb22261f6f1de7cc/kiraxejazipiniwire.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb54233d05---xetovetunodobipito.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b46377cba4b---lipeni.pdf
    • http://cn-noah.com/uploadfile/file/ziduwirakenivoxaxupidimul.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+reply+to+a+job+offer+in+linkedin
    • 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_off0000fcd7.bin
612d2d9d463bd8b1845205f8f6f2e044d2ce1e37883f184731fe67e2c92bfbaf
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD7 10876 bytes
font_01_sfnt_off000115d1.bin
da2a1d2fff5b072974967a8e924cb1c1b4a561578655f1e8af6d6a8b911b7266
pdf-font-stream PDF embedded font (sfnt) at offset 0x115D1 17832 bytes
font_02_sfnt_off00014491.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14491 16792 bytes