Malicious PDF — malware analysis report

Static analysis result for SHA-256 82edfa08d225697f…

MALICIOUS

PDF

85.8 KB Created: 2021-09-24 07:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 09fd5a750205d33116457935115f7ab9 SHA-1: 695b65161bc7e4e7d676774643d66ffa77780a7e SHA-256: 82edfa08d225697f20b38914563d0a23bd22e51f71fee84d3f9499ec203333b9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and multiple PDF links, some hosted on compromised CMS uploads, indicates a malicious intent to distribute further payloads or redirect users to phishing sites. The ClamAV detection and ML classifier strongly support this assessment. The embedded JavaScript likely facilitates the execution of malicious code or the download of additional malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/31686790411.pdf In PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/juvixuxuta.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/20831496050.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f83a42de6---kuxep.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614210df3038d---jalatukozugapuvelo.pdfIn PDF document text
    • https://artedelvalle.cl/gal/files/file/jitodikilisokedadu.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/63848340284.pdfIn PDF document text
    • http://lex.tj/img/file/55761005804.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210922151202.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614156380eda1---sewof.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/56194412871.pdfIn PDF document text
    • https://fobh.net/userfiles/files/gibisit.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/xubasudekofigeduzarabu.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/viwidukedelarisub.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/60756649458.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210916215127072.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/riwek.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/1206145173.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1614b5391d21bd---50009592086.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/videpaxonoretan.pdfIn PDF document text
    • https://hgb.se/filer/file/sajarirej.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/lunowavogarikodugu.pdfIn PDF document text
    • http://dichvubaove.online/upload/files/96312557999.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/59697741952.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=android+18+sex+gamePDF 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_off0000ece6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE6 17172 bytes
SHA-256: cfc31918bd4d1dc35aabb3055a29d53225cb775b2827296d8a74c58d5bcb5fdd
font_01_sfnt_off00011943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11943 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001315a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1315A 10792 bytes
SHA-256: bb3a20c13e6e1ca0652f15cf50ef63228891d0fa8dbbdcba95e90e766adf3406

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