Malicious PDF — malware analysis report

Static analysis result for SHA-256 4023d0cf5c5eef70…

MALICIOUS

PDF

86.5 KB Created: 2021-07-21 15:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e44115970dc9edaac54285a3ea1eed81 SHA-1: b0410b86b87175c7a9bbb2c86eee6b18d26daa5f SHA-256: 4023d0cf5c5eef7012c37c8d1bbb93c9979baf6e6ac7b5f60416e7b17e273899
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of multiple external URIs and link farm heuristics supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/dscqoh6ngiivqt0g9d5gpia7k7/loxadosagaxadaranole.pdf
    • https://perfecthospitals.org/FCKeditor/file/78133330662.pdf
    • http://chamdure.com/DATA/files/60454662086.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727761aff75---73509253354.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/fe7461a3dfd893d08f02e7ae8758259b/vokaban.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a25c44b6453---12961622273.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f2c64990e---27517208738.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160779394b5898---vokozin.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fda862f868---82642628423.pdf
    • http://imhkayseri.com/resimler/files/80888011993.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b22d804e21---59046314773.pdf
    • http://magooferta.pl/uploads/fck/file/femulig.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079efa2f1d04---11268792433.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/900459602d8063f26e00fa6c15f60b6f/85603749661.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/3bf41d90078dfdb916214f6d90b57532/debik.pdf
    • https://holocaustresearch.pl/nowy/photo/file/sawolideruxevubisibetowe.pdf
    • https://khabul.mn/mmpa/userfiles/files/mirodavexotukawo.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e69833bccc---vajefulosarezotuzerifofen.pdf
    • https://megashina24.ru/files/files/vuzawe.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc16f8874b---80231968699.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160e358ced8c78---26676940077.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d00b2e8ed---zeraniso.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/180227050d852f9fb3c55bad6f35e701/gobajagefaziwiwuzenibive.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160868207b690d---pevufetabinosolokol.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f42c3aee14---morumedujod.pdf
    • https://ipic.vn/userfiles/file/tejutejirupujudu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=horticulture+and+floriculture
    • 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_off0000ee9c.bin
7ac277d01a577959f3261d00f4f309cb5b13ceb4de1b836769415c198571b11f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9C 10392 bytes
font_01_sfnt_off0001062c.bin
517d6afd3bdc60cb42daa23f8e68041bbd20d8f0c1080b200a2b0b7f907978a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1062C 17512 bytes
font_02_sfnt_off000133f9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x133F9 16792 bytes