Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9f3a0a552df4931…

MALICIOUS

PDF

70.5 KB Created: 2021-09-25 21:20:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9bb5e47bcdacacec8599e0097e465d7d SHA-1: 3bf843e700b18b9ebbd5813d77f2a5eb7114283f SHA-256: f9f3a0a552df4931cd1309e84da9fc6abe556ce9a6c81a900f4e83ce3841e91e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on compromised websites. The embedded JavaScript likely serves to redirect the user to these malicious sites, which are part of a link farm designed to obscure the true malicious intent. The ClamAV detection and ML classifier strongly indicate malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=the+game+neil+strauss+free PDF link annotation
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/1hpejg0kh8gie6j9pfg7tq2nph/rivibuwuzelo.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/nozoza.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/96349209231.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/68315214862.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/kinamowerizazaxoziwix.pdfIn PDF document text
    • http://cocoal.com/uploads/file/bosoxagexugukamigox.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/86317125675.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/2325385369.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/mumezobutunonuwukus.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/beneturit.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/77758301303.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384bdd7c8c7---53949024456.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/ludisato.pdfIn PDF document text
    • http://laduses.nl/image/file/67005405257.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/72103292462.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/60227476836.pdfIn PDF document text
    • https://atiksigorta.com/files/sifunisit.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614841e092ee9---zovuxejavokelatu.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613faff9903af---samajageradakikovorol.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/wefulevuw.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/judizovoturuxeralafu.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/sivorotipefinuwela.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210919_CCADABC17A5FBF0F.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_off0000b1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C4 10604 bytes
SHA-256: 1fbd2df596e9b9067470d5aba04da22b1eaef9f34c5eba8673c6bf459ad10609
font_01_sfnt_off0000c9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D7 16796 bytes
SHA-256: 2016bdfaeb66d8b0dd2e1885c9669ec70e3c902dad88aa79dea67af21a6a018e

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