Malicious PDF — malware analysis report

Static analysis result for SHA-256 26dc7f3bea59dc33…

MALICIOUS

PDF

74.8 KB Created: 2021-06-25 23:17:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a925dcc1044f0592cbb37115b63d1f24 SHA-1: daf2c8ed3bb86f868521e46782b35897a0638d02 SHA-256: 26dc7f3bea59dc33926048724ab0c5a95edf0103f7cedd2ba7b84929f67965d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It contains numerous external URIs and link farm patterns, suggesting it's designed to redirect users to compromised websites or potentially malicious content. The presence of multiple distinct hosts and UTM parameters further supports the classification as a link farm used for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pistant.ru/uplcv?utm_term=last+of+the+mohicans+1971
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/96868371932.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5c42b3fea---25463699191.pdf
    • http://gphs84.com/clients/866382/File/57957801159.pdf
    • http://citra.cl/userfiles/file/1638702082.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be546e31ba2---51426869712.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/s180tevbikd5bbi70lc9skvdb6/mozuwogoxajivoxetosamuwam.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c31d35c0b3---kalibinezez.pdf
    • http://fapannimario.it/userfiles/files/61936363901.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c279add385---zojowo.pdf
    • https://autopratichesas.it/file/tivafawokenajowevamob.pdf
    • http://afghansolar.com/userfiles/file/56285404619.pdf
    • https://contabil-fiscal.ro/mm/file/65178485387.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609081dd7932e---gurupak.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/ulhuncaij9urdul0i94g29es7t/37141982791.pdf
    • http://baovephuongtroi.com/vietkiendo/upload/file/44187440882.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/733hmvnkboargfhisra416nao5/nukapakowunuxezamozeb.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bce32ae9089---96765161265.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/561f7af774ed1e25f017c61a114d71fb/kuvaliki.pdf
    • http://apexnepaltravel.com/userfiles/file/xavumuxedaja.pdf
    • https://ascinfratech.com/clientprojects/trading/file/12371810148.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b8e3b2d7b---guvewikosixekadifozub.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f1ac75a59---rutanedilusudubosusetuxu.pdf
    • http://internationalnetworksolutions.net/files/
    • http://zatacorp.com/upload/files/60397568214.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079721f36f60---namutexusigazuxake.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd36.bin
ed223f7f45b5c3710a2d4c0c0efc0facba98e2672f4a44c19bc67aec4f4e449c
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD36 18728 bytes
font_01_sfnt_off0000ed5c.bin
892bff3fcb9b9af84edc5442fbdb5029ec8226cc837bbc95f6338fc0f7ee0527
pdf-font-stream PDF embedded font (sfnt) at offset 0xED5C 10680 bytes
font_02_sfnt_off000105d6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x105D6 16792 bytes