Malicious PDF — malware analysis report

Static analysis result for SHA-256 64d4a19fa267a670…

MALICIOUS

PDF

74.5 KB Created: 2021-06-28 22:42:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1cbfed69849e50d0429af0708bc9cf3a SHA-1: 3a9d890867e275f004c9d897e9a833a119277502 SHA-256: 64d4a19fa267a670fce783bb0d1b3f854f9801f130ab7834254e0c3d972cb12d
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757e6634254---wixiluva.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e190ef3e7---kegapuruximopafukeviz.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c116018c57b---vodigadefabugis.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3fc5d63911f782e1fe8beb93c2a1e40d/9695212693.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/c1h4ftbeq3ojmurfnb3e5cl8me/57094949616.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c68a9860b9---33710785716.pdf
    • http://4998horo.gmmwireless.com/contents/files/mexuzajutijibixixuni.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/4f34340b6458b5b4681c65e6c445d7b5/35598142137.pdf
    • http://utuin.net/files/fckeditor/file/dijiwodegeriwela.pdf
    • http://harchovyk.com/userfiles/file/xalarijutubomigo.pdf
    • https://aprilboya.com/userfiles/file/27482696661.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832dadd5ae7---zopekes.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/q8vj17peipnk7aokqn7pk5p7r1/79316198705.pdf
    • http://aytekinpolatel.com/image/files/kobijofuvabitememubawaxi.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d983c48273---takijipobor.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160977f70f1468---xepotovixunewanusof.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/4ab29ed3e3a1bb29210232f5ac48c109/jaxafapusafakuwizi.pdf
    • http://notariocprietoa.com/notaria/documentos/files/bamerifebafelefiwukokat.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608718a0e89f1---sovenet.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1608092eaebf9a---93684597382.pdf
    • https://mfdesign.hu/files/file/xarikon.pdf
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f212c2a6aa---68276113712.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/7fb06f6066d4576905028c11b6adfb79/badevazenobol.pdf
    • http://screen.by/images/file/tetezowewevorifabe.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160899fe1634b5---96562770485.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/8hfm1p4ffuel7vcj2rplp8dv9e/10359982920.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f8bdbfa7f---63692698780.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=newspaper+template+for+school+project
    • 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_off0000c0e9.bin
5bfb7bd3dedf8fefba0ee7bf0b03756b24166a97088a32f4cafc4e5efa563de9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0E9 10740 bytes
font_01_sfnt_off0000d9c0.bin
01f7e794583f5275e3db72ddc27ece45cbd5f7db617ccfccdfc7e8f50fa38b31		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C0 16360 bytes
font_02_sfnt_off0001042e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1042E 16792 bytes

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