Malicious PDF — malware analysis report

Static analysis result for SHA-256 21b3f83e416cb8ab…

MALICIOUS

PDF

79.9 KB Created: 2021-08-28 19:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5242217793a6a0e591ade067c3a93eef SHA-1: fb48d915384956b337edbae2049f38b9fa640673 SHA-256: 21b3f83e416cb8abfb3e8e3ae35d6eeb39f7ddd67ace7fcf10aa1aa52a6efdfb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO-based redirection. The embedded JavaScript is likely responsible for initiating the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://crysiq.ru/uplcv?utm_term=butter+is+countable+or+uncountable+noun PDF link annotation
    • https://jagamimpi.org/contents/files/boromajoluvalore.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1aecd9a8f---mubajazajapotu.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096395b23d8c---kimopilivuwum.pdfIn PDF document text
    • https://kawanmto.net/contents//files/rekozu.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/beace33c4b6b79fdfd53c0a8cf19a081/lexejapevok.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/496bemqdhsfimcr5dse0hng124/71216785844.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/91796816336.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/arsbtp356snkbi3m7m5ha77m2b/raxukunos.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/fesusigojusegovoralowes.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e539069feb---21355237500.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/fodivibajobobodelivogud.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/5585a3403ecc10d9e28ecd40eda52323/menaketumowemotano.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/f6cad065b884fbe09797f973bfc4e291/16539546364.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/t6vead64f7i54847dgcmqrk57r/pejuparekomopekub.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/lajolomogegubo.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/pogivujiweber.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/be3mg05egb84ko9ln527nqeb5m/64725441319.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents//files/23836733184.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/jufubak.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b52b15d8504---vamog.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/orefavl0o3uqhh1hctti89s4fs/5828480542.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdac2c0165---worozemu.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094057768868---3615371804.pdfIn PDF document text
    • https://eurotechcorp.vn/admin/webroot/upload/image/files/70738550759.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_off0000d454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD454 17536 bytes
SHA-256: 0c761ac16b2c8823fb13237811b8baef6302143b25db01f021d34ca5baefeb97
font_01_sfnt_off000100f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001190c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190C 10516 bytes
SHA-256: 091a6bd54fbbdfa7f5c18b612912c7295cd8cdecbde8cb641e37f5788ae6c11c

Open this report in the interactive analyzer, or submit your own file for analysis.