Malicious PDF — malware analysis report

Static analysis result for SHA-256 4163871fd0ac23eb…

MALICIOUS

PDF

71.5 KB Created: 2021-09-19 07:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 25e3c74a0cff7d2940fab4671e09fa53 SHA-1: e758d938e25e2c28231260608426a23cc15f43a6 SHA-256: 4163871fd0ac23ebe8be6000c5da485438715466853e0708e4913e34431d2d1d
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://karapinler.com/calisma2/files/uploads/4353699046.pdf In PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/vakobizufovagaj.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/videtixovakesorod.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/27186375332.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/84000534902.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146560ba9813---17321700925.pdfIn PDF document text
    • https://hoongnau.com/upload/files/xoxesu.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391bfb2b8fe---jajomitofigugebitojezoz.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/99174263208.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/dehg15ko45i98fivnvnol4sapm/vujowafaxegeta.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/11107426170.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/fezakojopobunuvaxo.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/83279165466.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/ikn292kovl4m1pid4r2ot7fj65/mamix.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/gikugibepoduxo.pdfIn PDF document text
    • http://przystaneknida.pl/data/aktualnosci_imgs/file/76215595261.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/pijapo.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/watuxozesijopafoba.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/pukamagaguxe.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/vepen.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/4102229220.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/tixewuxumezomexarivo.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/xivafekinajidazapuligoki.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/rowikuxari.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=cbse+8th+class+science+bookPDF 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_off0000b87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB87B 10700 bytes
SHA-256: 9a2edb5b24bc05244e106c68f841b4dcaf4fabadc8abad431884b8f1d4074fa7
font_01_sfnt_off0000d109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD109 15652 bytes
SHA-256: bc802754318c658bc0246c095b2007e63823058bc9b06dd000c24c3598a0a5d8
font_02_sfnt_off0000f8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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