Malicious PDF — malware analysis report

Static analysis result for SHA-256 e290b57e2279164b…

MALICIOUS

PDF

95.0 KB Created: 2021-09-20 11:30:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 26f204060048ece02f8e075f217507b1 SHA-1: 4eb04894d45c1ff94fee8bcd5d75ad0361e5d2e6 SHA-256: e290b57e2279164bfae343ae844d32eb91c95b521451f002ab4bcfff5da99304
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • 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 https://inwebjor.ru/uplcv?utm_term=fellowship+of+the+ring+study+guide+pdf
    • http://budapesticukraszdak.hu/userfiles/files/69891504185.pdf
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/68544952012.pdf
    • http://licausi.it/userfiles/files/zuboruwobufusi.pdf
    • https://sanaspinler.com/calisma2/files/uploads/xuneta.pdf
    • https://jungleflightchiangmai.com/Uploads/files/3692565071.pdf
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/giwulupezewikabesivixuxox.pdf
    • http://daehnfeldt.com/userfiles/file/74366274046.pdf
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/ximakexexodotodeva.pdf
    • http://alibabashipping.com/userfiles/file/talixeburonafuf.pdf
    • http://onelove.cz/file/kitapofanojunimikuladusi.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/fa748d82a7f0927a9e703b49aa96ae81/6550764361.pdf
    • http://888chji.com/userfiles/files/38607525290.pdf
    • http://airelimpio.mx/img/editor/file/josoguja.pdf
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/woxinuwelotezonox.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/j14vbegj1j8pk4njk9h6u98oth/fuzuzipanatenelifavitin.pdf
    • http://bijverhoeven.nl/uploads/files/87501175450.pdf
    • https://smartmedia.ro/app/webroot/files/userfiles/files/47659221509.pdf
    • http://nhatnamvina.vn/rich_editor/file/60519854771.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/181b1ce33592c863bb9e0119f90d8a57/66433257979.pdf
    • https://dongcohonda.com/userfiles/file/xufotepigalizifukano.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16133490b5de4d---2121933738.pdf
    • http://shinhwajudan.com/userData/board/file/rigubipaferataxinu.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613936512e3d9---38365007542.pdf
    • https://keiba-like.biz/js/ckfinder/userfiles/files/dubugazirekasuvuf.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_off00010bc0.bin
ac70c6de435e96a2786018adbf7da2f902dc26980b3350adff3bd31d6b27f60b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC0 10892 bytes
font_01_sfnt_off000124bf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x124BF 16792 bytes
font_02_sfnt_off00013cd1.bin
18f124ffa26510e84a7d611dd32f43ae40dbf98de41e4bf2620ce6d01bb5fe72
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD1 18720 bytes