Malicious PDF — malware analysis report

Static analysis result for SHA-256 900e33da2302e592…

MALICIOUS

PDF

82.3 KB Created: 2021-09-11 16:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 05cdf4b54d80963457420c503a8a3956 SHA-1: 8daf3b94ea1f3ae9ff5296e1361ca2ceb11da82d SHA-256: 900e33da2302e5924125134a1489ce8ff4733c4c4b8804a8490fb2473724a422
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classifier flagging further supports malicious intent. The primary goal appears to be redirecting users to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://smogy.ru/files/files/josujox.pdf In PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/202739413566bcc44077d7b055c9517a/4323443103.pdfIn PDF document text
    • http://litroshaber.net/resimler/files/tonatazakadanuxiji.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/jozoka.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/29374383197.pdfIn PDF document text
    • https://koratspring.com/upload/file/vokafekas.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210901124350.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/sixeliramexa.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16133850010b32---23182898769.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a2bd6e65e---nifotuxikapasag.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/nitegaroretilasorix.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/28156657848.pdfIn PDF document text
    • http://alituncer.net/userfiles/file/12988748575.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/jekowinarokol.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/fv83rsodju8npl5033qoi4lhp3/wativajopi.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/worogikum.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/julifozof.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202109file/2021090721022070554.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/tofovizoxajufode.pdfIn PDF document text
    • http://carmakers.cz/userfiles/files/471076246.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/mukoxakexejebepaturipij.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/70979645075.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/3992009162.pdfIn PDF document text
    • https://0922.sproname.com/files/userfiles/files/54394621284.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/54758900508.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/23778076563.pdfIn PDF document text
    • http://halaljones.com/uploads/files/zawanupumanofejasobi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=app+to+view+instagram+private+accountPDF 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_off0000dc7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7C 17588 bytes
SHA-256: dad2a3c54fd867b9fc0185a62891bbf878ede6a93005a9334165e15361fc44a1
font_01_sfnt_off00010a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2A 10904 bytes
SHA-256: 7ade09d7b9de89e59893d3284311a332a916d9287d2bf1e0bd9cd6f2db994bce
font_02_sfnt_off00012397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12397 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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