Malicious PDF — malware analysis report

Static analysis result for SHA-256 0561d7076653be38…

MALICIOUS

PDF

88.4 KB Created: 2021-07-18 04:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 48584a034bb2d5f31e7323a948c05ad8 SHA-1: 3f15afeb5904abbf0cbff5fd0f67ffc893137002 SHA-256: 0561d7076653be38448a6931ec3664b04c84a9241f1dff3a7601920fb6b40f17
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d0cf7ca90---devetomazulowasa.pdf In PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8690f29363---4323308110.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/v5t4g3hdk90mlsk0psgtttv27m/banenilupir.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/fmj903prder4au5oj7oblgkdiv/valapevokokejow.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af591267c89---71254140257.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/mapajarijadisejupakazu.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/76920071237.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/42433841602.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/14504048207.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/50440302034.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7a21e1479---85723302037.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/44799880733.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608194cab064e---20082252308.pdfIn PDF document text
    • http://1976ahhs.com/clients/32223/File/73926990599.pdfIn PDF document text
    • https://cristalensi.com/public/File/11314658605.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/1bc0936d148409fcd247e73da8152694/kumijufisokuvagu.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/vesepowanemaj.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160866796154d9---metolusunojutepixig.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092eb9a84a1d---6842416395.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/43691500711.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087c34faf353---jepem.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/gakutazakezavuzodal.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/c514ee0aa44804071e4b6363b7b77476/funixisorukimilifaninofox.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/1iklj6rvsq0mpilcshfkbdjgq7/pomaxizik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=verbal+form+meaningPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FC 21340 bytes
SHA-256: 5e6270ebd32c0221ca8f7fbdbb9bfe20ed46ab734690571c7f5b41cd44202253
font_02_sfnt_off00012788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12788 10400 bytes
SHA-256: 95d1544a00d2b5ce0bb401fb0b4b13ce445c54075d03152d89800165ec8b4da8
font_03_sfnt_off00013efc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EFC 16060 bytes
SHA-256: 64af0185a2beffa7382febdf957b2ddd2015d3985e5bc97cf8ad64f3c2914973