Malicious PDF — malware analysis report

Static analysis result for SHA-256 5475f737de7ec83e…

MALICIOUS

PDF

74.5 KB Created: 2021-09-06 00:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 20f9d03475275c40f50814fcf4a3f977 SHA-1: 8c2c8cfe2f236c8f5a2cd84241d30535e9f35f0b SHA-256: 5475f737de7ec83e5d66674137f163abbaf77470cd5435f446a09ef47aea8bbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate the PDF is likely intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://smidgel.ru/uplcv?utm_term=file+to+pdf+download PDF link annotation
    • http://zae.me/datafiles/file/diguwuxanogetewupupudije.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/8db913c5be821d03f805659a83e9d080/57200278244.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/ks266q4e0glfvf3k1cfrgmdcmu/5363738552.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/3a94a27225bcb956296a09819d36ab8a/panuvulobafem.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/roweri.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/09d7d37b13d475d5de827d717a76a76d/fisofenorizemiwavuxekib.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf091bf067---dunabaf.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/kcnk2iap3491r90i859iqph3m6/bikuwitamoxujarexo.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/93t55tbceid44vmfv5ms6ob0q6/23656660274.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/bliud8obr42j3e3qu1g47gp31u/togasowivejefugep.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/perudupagokuzikiwegojala.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/3355fb5944f6a717827b57a37b9376ed/vazobubepifudunajib.pdfIn PDF document text
    • https://btegypt.com/file/gosebagogekesupeso.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/tarupexodobumeriroka.pdfIn PDF document text
    • https://ntc-container.com/upload/files/mosonex.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/53938726149.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/58864695391.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a3695d953---wazupapedipavafaxivajaja.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/jn4t4n0u4rak8c7b82hipjld9n/48988609461.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/05202512647.pdfIn PDF document text
    • http://119pump.net/d/files/2952359055.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/bovomojudutud.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/waxosototesipoz.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_off0000c353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC353 16660 bytes
SHA-256: 78917f63d74b9d3e8b9e46a41e867455f040a6a6be599dbcd29a044cc72787eb
font_01_sfnt_off0000eda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BB 10288 bytes
SHA-256: 000229369e35d9a66a4218c2c89ff023c4328509315070e6f642f58e8ebfec00

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