Malicious PDF — malware analysis report

Static analysis result for SHA-256 da546a37ffadae26…

MALICIOUS

PDF

87.1 KB Created: 2021-08-07 06:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0b2eca848d5fb1404b59148b36762605 SHA-1: afedd69a91e05025a83bebb1b886eee7f4dd867d SHA-256: da546a37ffadae26fff2b1b56ffe97d6602dc5f9fac0a1e7ba6f75d3c12ca932
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/c6f8267482fac38093aa16139b5e17e1/58677896467.pdf In PDF document text
    • http://cheers-gifts.com/userfiles/vajulojufadokevenabasexak.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16089c960206e4---88102644645.pdfIn PDF document text
    • http://kurpinar.com/img/userfiles/files/57703750810.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///watakuwazawusetozami.pdfIn PDF document text
    • http://e-hematologica.com/users//file/19425912496.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5c0904ad8---21095554424.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/revibawugilovito.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/89907270505.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/fawumopavoxazaf.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/13425376777.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/zuvolefa.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/3bfbdbf1e85c455a6feb8fa80abff38b/sagaxas.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/rekosujekibosamuda.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160836d67458b9---46951523208.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/4441017450.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/tivofumidutigafo.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/l5f1hp2meu7r2l9jbuc6nrj160/gefapobuxugazit.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/kegomorufenevemejijuzo.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/62512310308.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/90a68e77b694267dc4b40e580522ef72/69758966939.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/s7ds0n6uh1jvh4o6o8j5el0mnu/bemoro.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/17839757649.pdfIn PDF document text
    • http://vogiantinhmach.com/media/ftp/file/gigutezamo.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/mimufimaxebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+calculate+leave+sell+back+navyPDF 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_off0000f1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C2 16744 bytes
SHA-256: 537c6c69006e43e04c9e881081d9d7727853b8cf04107ffba431a673a431d6b0
font_01_sfnt_off00011d6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13583 10620 bytes
SHA-256: 819a7a4a62741b392c90c30736bec0d4391e6ceab032fec9b7d276f931aee359