Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a16c424c50a3bd4…

MALICIOUS

PDF

77.4 KB Created: 2021-09-09 04:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f3cc85b9f0c680a27e97c083886fd339 SHA-1: 99014436ca7f1c12047b0255db1a0d7b1427977e SHA-256: 4a16c424c50a3bd43d6d4292cd569285cb38eb30b983083eaea4ac00a87502b5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers, indicating malicious intent. It contains a link farm with multiple URLs pointing to disposable hosting and compromised CMS uploads, suggesting a phishing or malware distribution scheme. Embedded JavaScript was also detected, which could be used to further exploit the user or redirect them to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://sromedical.com/file_media/file_image/file/rikasemobu.pdf In PDF document text
    • http://thevalleytrader.com/files/67847885781.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/79390372768.pdfIn PDF document text
    • http://hak-al.com/resimler/files/77817658581.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/26340876561.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/52120916221.pdfIn PDF document text
    • http://santeh.md/img/files/xawitaguwo.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/74261700106.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/jameruzegak.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/wutedufizibonu.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16135c45ee9f75---weziduxeliguzinivo.pdfIn PDF document text
    • http://esistore.com/userfiles/file/bujus.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d74a6580c---50693208400.pdfIn PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/74316089545.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210909015633.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/fivefuseruzur.pdfIn PDF document text
    • http://dietgame.net/admin/fckeditor/data/file/20210905195053.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/96927143956.pdfIn PDF document text
    • http://bscartridge.com/pic/54945689661.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/muwovobeporuzedujaxug.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136bb9f2f343---ragikutavavi.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210903112922_1456387790.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/wojenib.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/witosa.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/92150693322.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/redojexumuno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=finding+perfect+square+calculatorPDF 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_off0000cb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5F 16644 bytes
SHA-256: 647f57ebec8703c42dce51470f601535dfdfd980c3ee7ab65a312949d20cce9a
font_01_sfnt_off0000f662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF662 11016 bytes
SHA-256: d0778a86268b3d97314965b836b6a88dff29b3f485f03410b2a26fb4e2b43799
font_02_sfnt_off00010f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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