Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ebf4d3fe3b681d3…

MALICIOUS

PDF

74.0 KB Created: 2021-09-11 16:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 32202cc21d0db427426002364e5c9999 SHA-1: 16c46e8baa8f85ced5755ee12c5c5a331f8a1b7e SHA-256: 9ebf4d3fe3b681d3ad48867729fdecb327cca627dd7d4453233ea78b4a235dbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The primary purpose appears to be redirecting users to potentially malicious content, consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://al-wesam.com/userfiles/files/13069420703.pdf In PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/saxeko.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/milotuzutefewesorunuporaf.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/cn4rk3bfn5s2k8hq13cgnc3d36/xofof.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/badoxuleb.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/sulolawanel.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9a9d536fd---lijarenoda.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/27822115487.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/2060936565.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/38921419901.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/21184617480.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/ruwoboweturubegaguvuresup.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/rarate.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcebb9b7d7---7774549945.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/jegat.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/r1hkt6f09avnd0ite5vlb6mcua/movipebepur.pdfIn PDF document text
    • http://support-cmu.com/filedata/file/84981962786.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/90304471535.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/50765763633.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/diditagobesepikedumipes.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/23059175560.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/pobefusabixodebider.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/69670691557.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=redmi+9s+pubgPDF 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_off0000c0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0A1 10556 bytes
SHA-256: f704766099341b1e9ea42df1584eb8e0668cf49b367f288b24859152211515e9
font_01_sfnt_off0000d843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD843 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF055 16584 bytes
SHA-256: 5b889bc834b7ce230709da4636f5c03ec69cbd64fc8f74bbdd29d2b7217c469c

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