Malicious PDF — malware analysis report

Static analysis result for SHA-256 43cd0a8e4d554482…

MALICIOUS

PDF

81.6 KB Created: 2021-09-18 23:30:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c7ab59716107f1daad00326e77d74a47 SHA-1: 5b29d7012cb644798c715d27452058102328f1c4 SHA-256: 43cd0a8e4d55448279f728367e6b87bbc5ecd8b1bc2a82ae0c21ef8f709ad78e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable hosting and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://getwealthythisyear.com/ckfinder/userfiles/files/nigexit.pdf In PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/4779921996.pdfIn PDF document text
    • http://tsuiteru66.com/userfiles/file/vevolaxusagapu.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/sasibofuzetudinodoreboje.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/895j2a3jtduf55jnft39c0gab5/webodevuzavepetujifalibog.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/26161990451.pdfIn PDF document text
    • https://loppisidjupdalen.se/images/uploaded/file/finunuxoru.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/10225791756.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/duvowovaromigamelonopemat.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/wokutidavi.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/nojatis.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/sowok.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/fabugure.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/guzip.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/sedowetorabikul.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/nanasil.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/zezopo.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/14636028244.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/vofawoxulezitamatavut.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16145f59136db8---pasegi.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7b65a8651---69994333430.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/9485685514.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=toxicwap+series+download+2021PDF 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_off0000d999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD999 10852 bytes
SHA-256: 372eb1ccf3759a41a274779fecc9a2bf96b3dc73018420690c58f2c238c72cd6
font_01_sfnt_off0000f2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B02 17972 bytes
SHA-256: 06056ad3988a7d1a2fea9d82b0a058d2fddb21e881e2df2a52611ec9d17c3e0d