Malicious PDF — malware analysis report

Static analysis result for SHA-256 e41daa997e6f7b4b…

MALICIOUS

PDF

82.1 KB Created: 2021-09-01 08:37:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ba0cd6d118fc313b222ae2d9afa6c005 SHA-1: a9617ee53081058f3be23603cbbb57053b027f93 SHA-256: e41daa997e6f7b4bab819fa7da79c3dd88b3d9729a5ee50e9e895528d926d63d
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 WordPress upload directories or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/jedadadupusugafusul.pdf In PDF document text
    • http://thaiboxes.com/piceditor/file/tikimafe.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/e88e3daa0b36443b11580337477b2220/38063600393.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609b77acccbc9---98017226117.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/xupitid.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/kuxegebepuxexenemuruwuza.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/668b1394cbfcdc7defdc769a762e9b89/gimodavetezosisewelavuzo.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/buwabeli.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/di3luuekn8amah3ffh7fbuk8p0/93363251768.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6abf5c47c---72624469484.pdfIn PDF document text
    • https://apra.pl/files/file/xebapumexuk.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/lifufizifozenevabifetatu.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16081f8493f9e6---sanifanux.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/99337602579.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b9285241f98---15880144054.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/024r13sdvck93mlhq2cufp8ump/nugizedub.pdfIn PDF document text
    • http://raczcsalad.hu/files/japekipexefa.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/zalitojenop.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/f32pr4ae92gjvr1tpubd6m6g4u/45757822190.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/kazarilugurekepowafewewe.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/subuvigut.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/10292105672.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160abde433c6f8---joket.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609841c1d6f24---35033920721.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=citizenship+test+questions+with+answersPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE68 16872 bytes
SHA-256: 69832e7848f3e02cb3817bc7f07b35030b3390cfb695aa502b0ccc4d2472887a
font_01_sfnt_off000109e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FC 10724 bytes
SHA-256: d039821463dd13aabc7aad3763f1a5067a8a2218e434505926b27ba66757a963