Malicious PDF — malware analysis report

Static analysis result for SHA-256 667bdee848ae122f…

MALICIOUS

PDF

82.8 KB Created: 2021-09-06 11:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: abbe96dbf3c974421f391c77fe6a5b43 SHA-1: 0fa4c58317fe9f332648f2a0bc5e31c85f1743a6 SHA-256: 667bdee848ae122f9bcf13c4ab2b5ad53d903912bcc8e2b2fd5c614c43a29828
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=mufti+ismail+menk+books+pdf PDF link annotation
    • http://andlupa.com/userfiles/file/64672817060.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160adee5e25186---96324994439.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/80843910236.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607adae6d627b---98519074461.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/27e543d97c801557711b59b3592f0b1d/67777938286.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/9v9pibaj1a0rev37lpa1nhqjj0/9782268156.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/253f4abe3d262ff9e0c88a741cbb8463/lunipupigojap.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b041d58f599---dekanuropadefakup.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/21313783804.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/d69fd9a759d7e288e66f3313cd27f32b/34694393564.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611f4ab184da7---miluduwigebamagege.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/b36bec88f30839f6dcea6b19917501dd/54372780731.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/09cea9d83562b9ea9757abd0a48b727d/vegazas.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16105f7f3a530c---senaririfenibokavudixiz.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/rovuvaxonuwesopes.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/bejufaburedaja.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/081852445465.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/nurewikisekaxafinavubimal.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16096b621186bc---39136615396.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/002e3d9088ee2e36e24863924823852a/vizuwojivadadetanexutotub.pdfIn PDF document text
    • https://j26clean.com/upload/files/17757675477.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/zomexeno.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/b3iput2jj1trdbm81rkqrqgrfh/nukowivodititap.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/5c1ade7e8824e67fff5eff5544a53656/42464493429.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_off0000def8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70A 17696 bytes
SHA-256: a5360cfd33518475d4ab6fb9613365176b51412d3cd2af14c0baf4690445a7fa
font_02_sfnt_off0001247f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1247F 10884 bytes
SHA-256: cf261efce4ffa70c041736e5e3b0309ad4dfb94f1861e099f11c38ca9b85dfbe

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