Malicious PDF — malware analysis report

Static analysis result for SHA-256 42854c9c30a7b54b…

MALICIOUS

PDF

97.1 KB Created: 2021-07-18 00:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d91cb0dd77b63bbac432c5717b3b2b44 SHA-1: d39857a26a5fa64fdc855a9ea9ffc42f30ca1cd0 SHA-256: 42854c9c30a7b54bbce14ff0e63d236f4e33710b3f4421933c034cfad2e3d23c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to redirect users to these malicious links, facilitating the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b957ac47789---zunafivosa.pdf
    • http://sarlampa.ru/upload_picture/muzonuxag.pdf
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/12757284620.pdf
    • http://arch-teh.com/pic/userfile/nuzufajifedovelisizofofev.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/434jkrmmncbmb1fadi9d7ui672/17940238024.pdf
    • http://cachnhietwin.com/luutru/files/50546568492.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/e12fe80sa2n93hka28stc2agb0/66992041141.pdf
    • http://ingenermarket.ru/userfiles/wewunovidazibaripejewabe.pdf
    • http://summithigh75.com/clients/867147/File/seduxunowozegugum.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/28c253135b74fecab9af4fcee6871f7d/tivuxeno.pdf
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/rifunowetafax.pdf
    • https://mimpi1pusat.com/contents//files/maviwitesovegibesobim.pdf
    • http://longbienco.com/js/ckfinder/userfiles/files/ditigenagokowafov.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a57398ffe3---92055552914.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbf26b130c---todomezet.pdf
    • http://dancephoto.ru/userfiles/files/83707068775.pdf
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/4aa5bacb9e2a691c60a244adbe347688/16125603858.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/34955601a320bf2abc2a34599e56901f/jawotofefubovuwevoluxone.pdf
    • https://giorgiosantinelli.it/file/74923875422.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/7t13hho94buos3mvl4j11to1ok/kaxapuji.pdf
    • https://houstoncoinshow.org/FCKeditor/file/56238064416.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/h3867lp8bsf6guqv31jodubrt8/dajar.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e2f451840---tanamasefuzikemejovuve.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+hypnotize+someone+without+them+knowing
    • 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_off000118c7.bin
b46527c0d6fc443dd0bde9dea105dc54f414f2332a1d4ca4156dea2e20022723
pdf-font-stream PDF embedded font (sfnt) at offset 0x118C7 10836 bytes
font_01_sfnt_off000131b1.bin
b5fcd4e224f4b49c5d89988f6b39cd66dd1acb71b72824906d770c3f14078c13
pdf-font-stream PDF embedded font (sfnt) at offset 0x131B1 17404 bytes
font_02_sfnt_off00015f09.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15F09 16792 bytes