Malicious PDF — malware analysis report

Static analysis result for SHA-256 4005905d73a007a4…

MALICIOUS

PDF

195.2 KB Created: 2021-08-11 22:28:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 59387502d782665fe382c237d8692639 SHA-1: 8ae7f5e7d334df0ad07f60926bdcbef15d2430b1 SHA-256: 4005905d73a007a471a12322499f3b3ca9403eb1b92111ff77cc01f121d1748c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous compromised WordPress upload directories and other disposable hosting sites, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to exploitation or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://atrax.hr/files/68880799033.pdf In PDF document text
    • http://auxerretv.com/content/public/file/96367006973.pdfIn PDF document text
    • https://dintek.eu/uploads/file/71000944977.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/vunomalemovo.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/95d6fd20d1f7fda200c48dae63deb6ae/272745609.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/bg87lm766552ff6h9rs54vh4n2/38120366947.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/renivok.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/kofonu.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac47bd1e65d---bukija.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/97902784996.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/37136054935.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/fitas.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/aaba9620605514e18e93646482761347/10775731326.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/f821d5af6273f15397e8ed8a7e4da079/73672484544.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/044d00877ef95a3de502c7efe7149f09/55354539595.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/97088809442.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073b801e8846---99022314929.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/79a7cbeb06d62b38f27feac5e4dde2fb/81634601827.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/a7edf39951324f174de75215a939f59b/72910505345.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210716232926_as1wju.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/okhsk92mggqhfh50dl5fnhg903/parigativopoj.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083605a11946---4991050045.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609464b0522d1---munivobesudel.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210717_F8FC2A444420FB5C.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/wezuxow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=educational+technology+multiple+choice+questions+and+answersPDF 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_off0002979a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2979A 11392 bytes
SHA-256: 4339db65dabb3e206c46644be695aa7858d9e62096893f4b1aa4cd7530862532
font_01_sfnt_off0002b1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B1CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002c9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C9DC 20712 bytes
SHA-256: 0b6ad6f3bd78d6b21bd6850a7480a7116005cdeb27eaba3cea8f50e6cc4d1e5e