Malicious PDF — malware analysis report

Static analysis result for SHA-256 402ffde6e66f26a0…

MALICIOUS

PDF

80.9 KB Created: 2021-07-23 03:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6cc6f516ae71e3846b18c8c29b43acbd SHA-1: 1aa963e03724bfbf35d830ff5473bb1a7da6d077 SHA-256: 402ffde6e66f26a0fa08003e16d624f4f1689c96da7830228798e13cf5fd64ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to numerous compromised WordPress sites and disposable hosting, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The presence of external URIs and the nature of the links indicate a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://kanat.com/upload/ckfinder/files/getitotugekezotavoxow.pdf In PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3d02705aa---lunise.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/v4e6cb153lbpscojt8ekrsrmhf/foxivukupepevofobizubitu.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073754995f71---23767837661.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/485f07089e7751f8f904719c7bb302fd/62949409727.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/vuseg.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/19397205733.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/2288645736.pdfIn PDF document text
    • http://accronline.com/userfiles/file/kivoluroresud.pdfIn PDF document text
    • http://flexicourse.cz/res/file/jejewasoxebetunigulo.pdfIn PDF document text
    • http://c-six.it/userfiles/files/purewalalenubopares.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087ffb9e4408---96093208664.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16077a355208d1---83415898882.pdfIn PDF document text
    • https://mahae.hu/files/files/dujufanatusu.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/fafavazuneran.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/66727d983f0ff05405a1cdb4caab5c66/75500854437.pdfIn PDF document text
    • http://yalciniskele.com/imgup/file/60821500378.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/tumugimideporewipaze.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/il4edtrctmq5hhd9o4hu3rgll4/xizuveduxutolexusenat.pdfIn PDF document text
    • https://tepihtrava.rs//files/wegonifivino.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/xusukurub.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/3acd1c75a83af921bd26eabf41847817/jomafopojetaduxabaneleb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=class+12+chemistry+notes+pdfPDF 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_off0000d98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98B 16184 bytes
SHA-256: 3ddf32fe4137425799589b63d1f02f8c6f8f13321653993ffbbee256a8a197f4
font_01_sfnt_off0001033c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B53 11200 bytes
SHA-256: 76ee82649511dda2dabb1abed5806ccd47dc1b390b359be12ab79dff11899b12

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