Malicious PDF — malware analysis report

Static analysis result for SHA-256 458d408b7b9ba791…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 13:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1fe100bb9390582586cc00841379c42c SHA-1: cadec8266cf5bc3269947c77c1216217a4abbee4 SHA-256: 458d408b7b9ba7910ade7fa042e3d4d0036c3de0eccf4810d86cd712b9006e8a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://medvor.ru/uplcv?utm_term=steve+harvey+act+like+a+success+pdf
    • http://mamaskitchenorder.com/uploads/files/63825146658.pdf
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/90979027813.pdf
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/tegona.pdf
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/75817016171.pdf
    • http://benrassam.com/uploads/files/4050955236.pdf
    • http://gekon.net/userfiles/file/67739116413.pdf
    • https://nergizleryapi.com/image/files/verolobizuvakeven.pdf
    • http://ebbers-schilderwerken.nl/uploads/files/masopubagagumesoralagu.pdf
    • http://xn----7sbndn5at.xn--p1ai/uploads/files/zoxuzufim.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/i0udb5i22qmm2kcd5ienjl80hc/wilidetat.pdf
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/74306352481.pdf
    • http://imhang.com/fckeditor/userfiles/image/31392064412.pdf
    • https://maurinet.com/userfiles/file/wifupukuwil.pdf
    • http://frutapac.es/ckfinder/userfiles/files/ravowetuja.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614450bbf2a1d---gogunitofubujep.pdf
    • http://rosesrealtyhomes.com/userfiles/files/23438312096.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/8c4cbc969ecd967d9ebaf7218c276fd2/gakukukenopopuja.pdf
    • http://realfootball.gr/userfiles/file/zovonomunamabokizojopadim.pdf
    • http://asztalosweb.hu/userfiles/file/24766900425.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140ae283fccc---nudexirilitopiwuj.pdf
    • http://ourdesign.hk/ckfinder/userfiles/files/64740802969.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef7d2ad501---50702018204.pdf
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/86967567145.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_off0000db16.bin
ca017c3481575267ec06152d9871c76a8b7737b5185b7005a2a10da2913257a6
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB16 10940 bytes
font_01_sfnt_off0000f498.bin
cb044d04fd3fe9140d14abbf0b8104a13218262da9a173cd48006c8116ee968d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF498 18268 bytes
font_02_sfnt_off00012353.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12353 16792 bytes