Malicious PDF — malware analysis report

Static analysis result for SHA-256 f59709007e0af3f8…

MALICIOUS

PDF

83.4 KB Created: 2021-09-07 10:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cc238d6a74030a51cea51d9f1231604e SHA-1: c96a4a7474e6dd9360c31c58da957d62d6a607e4 SHA-256: f59709007e0af3f8ef42ec22bf5af7f26ec893bc5036761cfe03404bdc0a711b
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting domains. This behavior is characteristic of a link farm designed to distribute phishing content or malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://alacarte-husum.de/userfiles/file/97726305211.pdf In PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16094a6bb46ddd---gebuw.pdfIn PDF document text
    • https://www.crpm.ch/ck/ckfinder/userfiles/files/bozuvakexu.pdfIn PDF document text
    • http://k1a.ru/images/files/file/66447043231.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100f37b22d70---91582218856.pdfIn PDF document text
    • http://sake-tori.com/images/library/File/numonegixomusenuzomuxuxum.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/suvaxisef.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/a5a59efe340469ca5e48eda4607da5c7/78547747507.pdfIn PDF document text
    • http://dc-3ed4d7413bdb.prshots.de/uploads/userfiles/1630281224/files/boduwirob.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609614d1ccfb8---67025598789.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/xekogaxam.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/budabomelipegegagipafa.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/91006694287.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/do1af69ob4e46qvg195s75q865/19867321139.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16080e0d31cde3---nuwevejizafazilived.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/devavifev.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/f925dc5efa24485b8c1a3fd2aa42d213/xugubagebagidofapage.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/44990077809.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb0f9ae2ab---tuzivenoverusitovadabikil.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/j59qp828svf55v8nv99a86va95/bofelolunofemuwegefes.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/338dc9b5858eb2ba4b9c84d0b3871ff0/xobugawebekigu.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c451548d7d1---26252102394.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/06697092225be52b2d0e62b9ff78e6db/33738554842.pdfIn PDF document text
    • http://spec-so.ru/sites/default/files/file/45678919955.pdfIn PDF document text
    • https://tidurmalam.com/contents//files/zugukamitonitaloz.pdfIn PDF document text
    • https://groupburuemas1.com/contents//files/xoriwonenoguxudaguxigolo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=personal+boundaries+worksheet+pdfPDF 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_off0000dd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9A 18900 bytes
SHA-256: cfe140db9a604b1f85a6e846fc9e8021e7bcd1302d3ab3461c1b1cffb41c4f2a
font_01_sfnt_off00010e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12624 11016 bytes
SHA-256: 15fc4c793181a41f71fc258685c709d8284a4329a332fb81f72ef7ddf15de808