Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b4e5cc4473d2ea9…

MALICIOUS

PDF

73.4 KB Created: 2021-09-16 10:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8347520233695b08b2815255e7b66d44 SHA-1: 858dad2bf541b3ce045f6bda34eb542c4aa0bd71 SHA-256: 3b4e5cc4473d2ea9427385ca9826aeffe2d87150e2cfc267071a8e55f50a9169
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://oreopay58.com/ckfinder/userfiles/files/belefolubonajuf.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16142a89c7716c---9256050633.pdf
    • https://textosolutionslinguistiques.com/upload/editor/file/jawekubejipilo.pdf
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/mowurave.pdf
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/27063990946.pdf
    • http://sgrappresentanze.eu/userfiles/files/77855333307.pdf
    • https://toolsatool.com/userfiles/files/zagagesererizisumasupo.pdf
    • https://onderdurdu.com/upload/ckfinder/files/xodawewadejasoromobo.pdf
    • http://nbc.com.vn/ckfinder/userfiles/files/bovuvodesetubefeza.pdf
    • http://garagehayashi.com/js/upload/files/tamewavisux.pdf
    • http://vanlysecurity.vn/vanly/album/files/51740806921.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/2adca243305a23ee2b1f8f61af6b7c16/woxatumisobezazofo.pdf
    • http://dush-kz.ru/uploads/fck/file/durugavimevev.pdf
    • http://emotionpicturesfestival.gr/userfiles/file/lijagifogasakavipawana.pdf
    • http://miwon.com.vn/app/webroot/uploads/files/12343179954.pdf
    • http://iccarrentals.com/files/file/90030633223.pdf
    • http://ketoanantamhcm.com/uploads/files/gurinikuf.pdf
    • https://trisyscom.com/userfiles/file/pizajarogimasotigajevu.pdf
    • https://gruppopolidori.com/upload/image/file/godafolibemofopevijipaleb.pdf
    • https://dwitunggaljaya.com/sitefiles/file/mezusolovasaru.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613f51a37fa60---95484522048.pdf
    • https://stiff.pl/ckfinder/userfiles/files/rapemixajamu.pdf
    • http://zhongyuemedia.com/filespath/files/20210903080847.pdf
    • http://sinhorelli.com/userfiles/file/ziwemelit.pdf
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/93221088142.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=trigonal+bipyramidal+geometry
    • 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_off0000bdcc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBDCC 16792 bytes
font_01_sfnt_off0000d5e3.bin
4eaea9186c87d793f7dc7da76a7f3829348df53378f19fc32fb18b069b0c1bf4
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E3 10784 bytes
font_02_sfnt_off0000ee37.bin
a4136fc09827a366a6c6f2628789b856ba2a293ed49b5a1b9e8c95740fa00e06
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE37 16204 bytes