Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aed33ef69fca306…

MALICIOUS

PDF

80.1 KB Created: 2021-09-19 08:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 1941414ca625f61bdc94dbf95acdf5ac SHA-1: 43b78efa47ebab5a66c7398112bc00f5afbaf7e6 SHA-256: 0aed33ef69fca30678aa6d56de4ae469dcdd973f02fb19822ed23fd8ae28933b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. Several heuristics indicate the PDF is part of a link farm hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://lammensfilip.be/uploads/files/wovezokivegefa.pdf In PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/begekerugogimidoseni.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/e6c5d6e2753cfbe46dc125696feac8ee/nuromenuxin.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/moxopezama.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/69801824702.pdfIn PDF document text
    • http://sushibelovo.ru/files/lebumituvo.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26618009516.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/pasifikutovowamul.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16137a09704a83---wixixolanaxewibakuwu.pdfIn PDF document text
    • http://sswjeans.com/files/jidetawajononasudajik.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210904025358763.pdfIn PDF document text
    • http://internet-trade.cz/UserFiles/file/delawib.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/73211452392.pdfIn PDF document text
    • http://jngf.cn/files/file/21835878559.pdfIn PDF document text
    • http://halongwave.com/userfiles/file/xakikexan.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/98299397971.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/60803591646.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/15943047811.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///66075087256.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/86506111254.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/71917331815.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/1c5f437d6eebee3d1d9d76a34927b37a/raruzetopum.pdfIn PDF document text
    • http://lamay.de/userfiles/file/naninokusejo.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/tuzifasivaweworolewoxegoz.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/87982686069.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/97269463625.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/77556041630.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=minecraft+pe+cannot+connect+to+serverPDF 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_off0000d2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B6 18352 bytes
SHA-256: 2861ad2b23be50930721b61d0da36d288c8b6b54a531e6d21b1c5faba875a9fb
font_01_sfnt_off00010285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10285 10484 bytes
SHA-256: 9081832ea73537caf16126b536832163b9c26a67e3725bcb582ed3ea5fc75e9d
font_02_sfnt_off00011a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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