Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6271f1b6791559c…

MALICIOUS

PDF

86.0 KB Created: 2021-09-06 17:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8176706b8a95c4480f5b69c89974a6b8 SHA-1: 882fdc43692a89b28ba19f6a8d7a5d6466c7a49b SHA-256: b6271f1b6791559cdd97f9833e38709833645132ef9af19038b23eba999fcd0b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of embedded JavaScript suggests an attempt to execute malicious code or further obfuscate the redirection process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://laborke.ru/uplcv?utm_term=spiritual+intelligence+the+ultimate+intelligence+danah+zohar+pdf PDF link annotation
    • http://summithigh49.com/clients/3/33/3334069ac8a672cbece4a9536eb221cc/File/97076828162.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/xibikuneso.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a006637b33e---vikesatim.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/21245516273.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/nubelin.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7fc12d129---sitimilamem.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d65841c6e---27389809839.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/21869884515.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/53026806818.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/24341822873.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120c393a008c---duboxoredimesilopirefi.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/tivag.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/93716517020.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/44698220895.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/81081754873.pdfIn PDF document text
    • http://industrialdevices.in/uploads/79089904640.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/nafuzijafumokewomi.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/jarenadejexeb.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/falosagira.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/dunexesuru.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/jogonufabime.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/leniwakajavewopekokamen.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_off0000e8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CD 11136 bytes
SHA-256: 3ed507df7c8ffc90934544ca90423500116397509815ecfead0bdf56869493bf
font_01_sfnt_off0001026b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026B 18084 bytes
SHA-256: b5f0cb5a319b3c2532dd45f84ab2c82f627bedc665a55659dd572048b9c84c41
font_02_sfnt_off00013178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13178 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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