Malicious PDF — malware analysis report

Static analysis result for SHA-256 db02dfb6fb636c44…

MALICIOUS

PDF

71.4 KB Created: 2021-09-25 22:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cade498dca24073159743151fb82abb1 SHA-1: de2c4104ecebf9fb1ca3f7ae3354c95f5c0cb7ba SHA-256: db02dfb6fb636c44fd2bba6a81a66349801477c412bb241ea61d03a111ec0f02
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 an embedded JavaScript stream and a large number of external URIs, many of which point to disposable hosting or compromised CMS upload directories. This indicates the PDF is likely used to redirect users to malicious sites or download further payloads, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://3qlohas.com/CKEdit/upload/files/kafobikoxisopazigesun.pdf In PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/f9d89436d92c901e0a65506624264d26/rijipezoziwokururakobu.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/gotebomisefo.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/wivipuvosavaniwenibus.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/kuvemigif.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/79317805530.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/45182112949.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/pozulefereloviv.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d4fb4d5e5---fokenawarefowu.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/48970174475.pdfIn PDF document text
    • http://efrex.cz/files/file/46143913599.pdfIn PDF document text
    • https://dafelia.com/files/jumole.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/54945663045.pdfIn PDF document text
    • http://ustunongel.com/image/files/37608417361.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/72010251732.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/1878437466.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/b83c8a40e874909d57733e37d5fd3f80/79053075851.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/39458426804.pdfIn PDF document text
    • http://classtool.info/upload/files/volenetasumelotobad.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/gejarotibozaduwuxul.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/lexisebosinupa.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/bidorive.pdfIn PDF document text
    • https://combrooncom.com/contents/files/meginotubatekujube.pdfIn PDF document text
    • https://europartner2.pl/uploads/novaxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=ancient+megalodon+hungry+shark+worldPDF 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_off0000b334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB334 16444 bytes
SHA-256: eb915918d58c66cf78fb1e73bdc45eaa1563cc75fc036f244c6a3bb66de3cc8b
font_01_sfnt_off0000dd82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF599 11188 bytes
SHA-256: 9c1aa55d9625b085f32497cb5c18de0b6aa7b3cd71164d97d53184321c2083c0

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