Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d60dfbed16d0a4a…

MALICIOUS

PDF

83.9 KB Created: 2021-09-09 11:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5cd65b9cc729a46a4e9aa6486bfc3065 SHA-1: 484f49ed5f97af967de95e09d5ef29753b6a3cf7 SHA-256: 8d60dfbed16d0a4ab3e9a12b1eb6da42bd45a6957886ca4ad96be8bfa79c7cfc
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal multiple links pointing to external PDFs hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing or malware distribution campaign, likely using a spearphishing attachment as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://laborke.ru/uplcv?utm_term=car+parking+multiplayer+android+1 PDF link annotation
    • http://www.flamanville-76.fr/upload/file/fomut.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/suxabebelavinatodazib.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/29235931758.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/77394880151.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/dizevufusuvosafutepok.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/19724840162.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139267585ac2---23984792744.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/89442899861.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/xusek.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/19186049830.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/ac1c0d9d123387ce851b33cfdfc395ca/32973131740.pdfIn PDF document text
    • http://ebara.com.hk/ckfinder/Zenith/userfiles/files/jedutikeroxizexure.pdfIn PDF document text
    • http://veitali.com/upload/files/mididerukogiba.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/sisigadewonoveboviw.pdfIn PDF document text
    • https://polytex.de/sites/default/files/88478271165.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/faparilorije.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/dumamibi.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/fuwosobarigagenowaxiku.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/wuverin.pdfIn PDF document text
    • http://artospace.com/pics/file/73810825036.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/xusavitudulubol.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139641359813---sosun.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/tevadowora.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/aba8e86ee2d127874b0bddfb86891b72/82878286605.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/dekujoxagujelid.pdfIn PDF document text
    • 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_off0000e0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E4 10956 bytes
SHA-256: d5cb982efcc96cb855383a8db71a854da61fff17bc04a5ec87cd347c7c2406e1
font_01_sfnt_off0000fa21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA21 18032 bytes
SHA-256: dc26f7997644ac099edb09d68a758036e95fb544ed5e03034452e5bf2e63b36b
font_02_sfnt_off00012972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12972 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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