Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d74c07917e799f…

MALICIOUS

PDF

75.1 KB Created: 2021-09-03 08:18:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b2e03eec39aa23f1ca95e37ccc7f5467 SHA-1: e6b34896f1a62f263e0557b2fdb3146c65d890aa SHA-256: 83d74c07917e799f19982e5ad20541fe1ff46e12ffaf74dd5ff2aa017540b619
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting, forming a link farm. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer, likely to facilitate further compromise or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hoanggiaphatland.com/uploads/image/files/57361941274.pdf
    • https://grnca.org/img/files/files/posirapugarimajeje.pdf
    • https://www.igescanada.com/ckfinder/userfiles/files/1076928414.pdf
    • https://anmoul.com/userfiles/file/41490567599.pdf
    • http://dailymaydemtien.com/userfiles/files/70839786633.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/06fa7150edf2f76f840fb6769a69b34b/49818198622.pdf
    • http://all-pass.com/folder/editor/file/97578814871.pdf
    • https://noihoithanhtuan.com/media/ftp/file/korukirefaxuzoluwijegar.pdf
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/surer.pdf
    • http://airetechservices.com/userfiles/files/xuzafuxozaposesopoxonod.pdf
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/wetoxajoxujuviwavekuvud.pdf
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/0fa184b533d8c78a5b35b30d86c4db5a/pubinalorav.pdf
    • http://metisentry.net/ckfinder/userfiles/files/wejalomarubukigikub.pdf
    • http://backyardreleaf.ca/clients/6/6a/6a4eaaf8452764cb6fc14c9064ed0c71/File/42633338593.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cda68a63a8---38511853689.pdf
    • http://xingyeknitting.com/userfiles/files/gofuxevigametoxokomikakol.pdf
    • http://klubalfa.org/img/userfiles/file/vozufubifugizogakanaduge.pdf
    • https://hmanagement.net/userfiles/file/81782194739.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/34c7f3380504f48334f061c6e2e6dff8/96655251845.pdf
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/bananugup.pdf
    • http://oroblupiscine.it/userfiles/files/15651019764.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f8f7115afa5---72422197936.pdf
    • http://hoinhikhoavn.com/img/files/xexefovorovuwisiv.pdf
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/tejumozunurovadimuxijor.pdf
    • http://koreaseowon.com/ckupload/files/jewabagobutoloxokabedax.pdf
    • http://sgd42.ru/userfiles/file/gojugaxakatoposukivaj.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=forever+and+a+day+james+bond+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_off0000c3a0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A0 16792 bytes
font_01_sfnt_off0000dbb7.bin
9489b7f45e6c9952e7f9ad1e6ecf5421056483d7e59bea8e87228f72ed00f573
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB7 10848 bytes
font_02_sfnt_off0000f484.bin
0cde62fd54890041590e4ec95582db329d9efbde2edaf365c37894fa1a60a499
pdf-font-stream PDF embedded font (sfnt) at offset 0xF484 16356 bytes