Malicious PDF — malware analysis report

Static analysis result for SHA-256 254db60b1ed5f591…

MALICIOUS

PDF

135.1 KB Created: 2021-06-27 19:34:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 8e5d1927afba58d6fb3b28fb5cbbdaec SHA-1: 22e039b822adf480ac33e3d0d9ba21b6b6b303f9 SHA-256: 254db60b1ed5f591cfbd5fc4a215fd18e225becfacb4f2c51987348348491af4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to compromised WordPress sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these sites to host or link to malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely to lure users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9763

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://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d83a4ab452---fobejimimovumovunolo.pdf In PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a890b427faa---50109549014.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16092b7c2b932a---norefed.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/67jaloujsus3pps3bp33mdq3g7/lomerexevomolajiz.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/72787e72acb1a256c67b5c577c6cff62/luvibolikumexidowudafuruz.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/6ef503a5bdb8f5beac0fb499fbffcd39/gomuzewisovedo.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/43400480495.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/negasuxanaxomow.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608079bb35c0a---78927006004.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607483eb50be2---71388792299.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/trbervu4hghls5to8mbttos9v7/90638582939.pdfIn PDF document text
    • http://co-mit.com/uploads/files/kemofepafovefoxuzuj.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16086471686168---36712661817.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/ramuxizafatifaxagakata.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b86b9aa49b1---nijedefotizaxemumero.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3b8c159c1---69192269544.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/6ab2be4780a6f0438bb340f16c98c9cb/gujedagugefenurasawogegiz.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-21/20210521172708921786.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee71acd93b---verikojifefozutato.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/sodigizadodobareji.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/39413051400.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/419b0932a70afb47db0fdb7703c3a3f9/nefexobivixifoderon.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608781124a09d---zamotenadepatinopepefi.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c6414848674---81857927324.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/xijawolel.pdfIn PDF document text
    • http://bulongvungtau.com/media/ftp/file/69745926741.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=axel+honneth+the+struggle+for+recognitionPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ab7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB7C 19288 bytes
SHA-256: 9aec3cd1536a450ea4bc606b00bd3e1ba51d22c72c7724dc28a626f0650474a1
font_01_sfnt_off0001dc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DC3F 10636 bytes
SHA-256: 44e968d24d06b5aa81bd7a11461eeca78939962c1ad08ded8867d59b2dcfa025
font_02_sfnt_off0001f494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F494 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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