Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bde7d0d2f3dae5d…

MALICIOUS

PDF

73.3 KB Created: 2021-09-16 02:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f1b6256bde9f0c191b5b152c4b3dba5c SHA-1: 367e9982390b6dae2d34048eec030baa9edb00d4 SHA-256: 4bde7d0d2f3dae5d9174d4bcf0c1bb6d096f4b2231a76f99f15bdf7b5e2e5fb1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external links, many of which point to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://baominhlabors.com/upload/files/vobexosojozodaxuju.pdf In PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/zikawuxuzafozav.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210911201253.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/zixuxudinazutitawizilinir.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/54213423971.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/gelowitavusut.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/mumixeg.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/1544201bf9292e7865dae40153e72263/wejikajotazo.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/daraduwas.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/nekidupuw.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/sarubasutazot.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/wezuzusosemafifegerunuje.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a35f406d06---93310174812.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/f161271e71362bffbeed6f1b77b1d50f/razarepejovevenuwopuvo.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/vivinelewute.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/dotigitapugamokem.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/3532472075.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/pafudesuse.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/81762778373.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/gupevolu.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/xisagisejuv.pdfIn PDF document text
    • https://congchung7.com/upload/file/gosifudesasepokiruzes.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/gosizupaxorikilupexovira.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/7f89279a713b3a070eb9a90e40342208/kilutigixi.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/38235847223.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/86225799283.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=sun+max+vpn+apkPDF 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_off0000be4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE4C 10092 bytes
SHA-256: 334282dfdff4cc6204a905ff65105149f698a02a9ef88702d2f69145b3bf3a3d
font_01_sfnt_off0000d4c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C9 16628 bytes
SHA-256: 6433639009c932457e7ea4bad9d272ea2035c3b5b5411c8447c893588427a201
font_02_sfnt_off0000ff98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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