Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcae734ea417d91f…

MALICIOUS

PDF

91.7 KB Created: 2021-07-01 14:53:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 50869cd4b8f1a06884bcf04609a25b8f SHA-1: 2f93c21ab40d2b8a37c6cc9e37270af9ca62aaad SHA-256: dcae734ea417d91fe6b949208b9ddf9eb938b8803d3736132507bfd11033c83d
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 are part of a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://laborke.ru/uplcv?utm_term=how+does+steam+open+pores PDF link annotation
    • http://tremonttemplemacon.com/clients/862779/File/48756222309.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1609833f9527ec---91195300557.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/57283051072.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/bopimote.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/kelubamizepojomabitula.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/nowexagota.pdfIn PDF document text
    • https://chaplains-camps.org/upload_picture/file/bagebil.pdfIn PDF document text
    • http://ashioke.com/images/library/File/zikojutidoruxubesesud.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a41a2befb13---mufodoroperigawitepazasi.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/0d55a2b175366f90cd5b6c649667569e/nadeti.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/7c6d5fff535a291fdef0cb07915ca4dc/6540183842.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160849dec7eaf5---35421710653.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098388227b75---wajosaseli.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/lafegikab.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/8f38c5f366139eb09b0a562049a9f5b5/binuvir.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609f21ee56f33---xogilemanapu.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/62349150849.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/gifuvibov.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/821c54545d9a00d5380cb03bb28ef8b4/xedumatakanajasususizune.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/65410831090.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/61212237206.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e3723126c---lefiwelovuzewe.pdfIn PDF document text
    • http://sierrahighalumni.com/clients/878712/File/9743849768.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/b41015cf91ef6eca29b48e06495c8163/wubanexogagabedamiximel.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10380 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B92 18052 bytes
SHA-256: e12198f4f17f1b68d2a8ffe68fe3031292b3343b8cfdc480c1f4204982219a33
font_02_sfnt_off000149cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149CD 10492 bytes
SHA-256: 0e51d0672453a1e23a8c5d43a8bd74fff02d84467001c55885003805b3e40030

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