Malicious PDF — malware analysis report

Static analysis result for SHA-256 d08d2afa130a7e4b…

MALICIOUS

PDF

98.4 KB Created: 2021-09-20 10:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b48845a5d43dbbcb11be21b647ec3eac SHA-1: 67189ddddfc49e74aafc853877fb9f3d0a8b777d SHA-256: d08d2afa130a7e4b850fd61b45ec9166aa9bc2229e50e1f05d3eb8b8248c4981
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that contains embedded JavaScript, which is a common technique for executing malicious code. Heuristics indicate that the PDF contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://cybernet-ap.com/UserFiles/File/sapozoboxatirizufav.pdf In PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/3569722315.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133df641bbca---34312682578.pdfIn PDF document text
    • http://thaymanhinhlaptop.com/userfiles/file/40429762538.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409ec594a98---pewiwiwoputunekozof.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/vezoradafuzonubekavunufi.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/40948599416.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/50451567364.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/22787595183.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/67212319793.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/83957522477.pdfIn PDF document text
    • http://c-six.it/userfiles/files/34554581803.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/nusitisoj.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/delejija.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/61426796550.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/31345655867.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/bazigewagavurixopazujazu.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336efe3c5d9---podapovukuru.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/jemexelug.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/tejubuporixaf.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/62620361796.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/60614129096.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/fejuzepixi.pdfIn PDF document text
    • http://jainfarms.com/uploads/zimukavefinele.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea676dd67e---10000408534.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=apk+de+bloons+td+6PDF 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_off00011bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB2 10412 bytes
SHA-256: c2e7f9aa697e5b0045a7d24f3b95a03085339984a0e4b9e05a285d98fc358623
font_01_sfnt_off0001333a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1333A 18724 bytes
SHA-256: b9f1568c33c6412683114d357d13876efcd82476df2f8cfb9d0c3c8bd7c158fa
font_02_sfnt_off000163ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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