Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b9d00358e91bb83…

MALICIOUS

PDF

83.2 KB Created: 2021-09-01 04:28:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: eda2cff736b5114e2a38b80f7d4a6a0d SHA-1: f6dc2bddb81be07d7868105153357d12a307d192 SHA-256: 8b9d00358e91bb83d83a55292d6eebe1dfc21af905daea2078443726f2e05c2b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites acting as hosting for other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The structure suggests a link farm designed to obscure the ultimate destination and leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4a4216bca7---78315003052.pdf In PDF document text
    • https://pointvirgule.ca/upload/editor/file/45094161765.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/94114999745.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3de507a59---12823889643.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d1c0b1850---3072380033.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16097b76e390f8---bababogevibitodemivebu.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/bejirafifed.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/53268753650.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/22adf27a485f562475d8f05b03a9a80f/6094393433.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/24389771586.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/acn2964qpvme4tbvbe78pjns6o/pabebonofinekivaseb.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/18097799291.pdfIn PDF document text
    • http://emurus.jp/userfiles/file/5798173604.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b25e937fa28---22650754808.pdfIn PDF document text
    • https://turismoporsantander.com/aym_image/files/pisonifatolasarupikagi.pdfIn PDF document text
    • http://www.celso.org/download/rorewesigibifuberatuxula.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/thulbs5rjmedpfi1dgj8clv3kq/vapakalanalupajako.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/76193195825.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/4ee58ef353aa2ae019028fe8cd236c64/matolavatamuwakedilixe.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16108352709545---51810587298.pdfIn PDF document text
    • http://change4best.ru/upload/file/jafikofatatawid.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/titimurunutalafuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=at+your+next+conveniencePDF 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_off0000df2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2D 17824 bytes
SHA-256: 7c609880a6febcf5bbfe866e99c85b50ecbb5a97953b355095695cf79c2b90b7
font_01_sfnt_off00010daa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAA 10212 bytes
SHA-256: 24fa2c070cb7a941541974d6fd971b9b6f8ecf71b7c7ebbe5307c75dbb8b4858
font_02_sfnt_off000124c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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