Malicious PDF — malware analysis report

Static analysis result for SHA-256 96342bb0a3a37e39…

MALICIOUS

PDF

77.8 KB Created: 2021-09-17 07:38:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fbc07352cc7edec53f9333395a81a06e SHA-1: 3e3bade12bf16fcb3184163392f6e3f5365b2bc9 SHA-256: 96342bb0a3a37e39d27cb04cc3b006808fc7c6d3996a050c7b024ee2bfa65edc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of numerous unknown reputation URLs reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://salonorganica.ru/upload/files/80689533919.pdf In PDF document text
    • http://usa-ex.com/images/blog/file/28836920081.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/71797740526.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/53030410128.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/18883833638.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/nujafetobomapulutofepo.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/47277041882.pdfIn PDF document text
    • http://keramann.ru/uploads/files/5299489559.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/ziwip.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/judibazofumirugodetax.pdfIn PDF document text
    • https://mollis.rs/files/tubujamiporimatixinonomet.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/34329069167.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424f8a5429e---36015372237.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/96251628187.pdfIn PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/52008327616.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d158a1a637---29210842744.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/kphn9rnkubfh6bkkuida8t8nga/50015030.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/8919860254.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/58697144832.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16142da19eb039---lawirojabebumamesav.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/sq8kpme8hr773afvpt6altbial/66989843473.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/96435527252.pdfIn PDF document text
    • http://siamintertrade.com/file_media/file_image/file/lovavowen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=efootball+pes+2021+apk+downloadPDF 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_off0000c749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC749 10892 bytes
SHA-256: 5da078e76d685dda762800ae5ab895fd441de04c789e4396b35b5711aaf083e1
font_01_sfnt_off0000e094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE094 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A6 18872 bytes
SHA-256: 288fe09ec72ef9dcf87b3e135399fd4d2e98ebd3020c6735579580af3bfd7ded