Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcb3d728f8599622…

MALICIOUS

PDF

70.7 KB Created: 2021-09-28 15:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 180009a4f8332891c838a7853ad39234 SHA-1: 9236a11f296463900464573f8e235e9ad6883822 SHA-256: dcb3d728f85996227e05a589c379b68cd1321b5ee7c0dcd213c2dc0e5bf3e95b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The embedded JavaScript is likely used to redirect the user to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.supair-lux.hu/ckfinder/userfiles/files/44973978537.pdf In PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/wikivixigosipenenaxoraguj.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/lexux.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/wuzugijatosubonofokuje.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/d7d9e57fd44b5314fc6e549951cf8fc1/40461626154.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/84194051052.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e586f013c0---23317848562.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/24540964892.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/nosexuvof.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/21547591064.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/4758315177.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/jerugero.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/84678358787.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/64417549908.pdfIn PDF document text
    • http://www.optimizecost.com/admin/ficheros_fckedit_subidos/40425823533.pdfIn PDF document text
    • http://szpk.hu/_user/file/47148479013.pdfIn PDF document text
    • https://onderhoudnlgarantie.nl/upload/file/sawuwuxewixumasatop.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/buzuruvixakesus.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/96108570618.pdfIn PDF document text
    • http://retailcop.ca/files/1873590153.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7c15029af---wavixatumog.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/raq1hddfpgnr4cbevnng81rqf4/30406607865.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/moralu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=why+is+my+phone+saying+no+network+availablePDF 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_off0000b10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB10E 11188 bytes
SHA-256: 36b10dca4572dd08c55e8b206a14afd29247b794020e193ace0a5712ba8e5dc6
font_01_sfnt_off0000caed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FF 15696 bytes
SHA-256: a7641aa00c6a13087604637b1f6d112ad71a26b36b0b2bb31bf08beca8c65a2c

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