Malicious PDF — malware analysis report

Static analysis result for SHA-256 baa664e088447218…

MALICIOUS

PDF

93.9 KB Created: 2021-08-12 04:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bc48a8f62bb18592ec5c27729bb8c057 SHA-1: 3737f535d72618344faa4a32cdf6e4895fdf12db SHA-256: baa664e088447218a2ba6dcf8c79593e45491ef528ed9c6ff47cfc351b56bd0e
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 upload directories or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware sites. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://studiosantese.eu/userfiles/files/gewutodufototuvaruwudukix.pdf In PDF document text
    • http://reicar.dk/userfiles/file/wibizojamonotipolunikixa.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a42f751cd5c---lojunirafewibaj.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160d05f640d193---lazemi.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/dc1smfae835pq10vfgfcfjj1qt/87672115903.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/61f670d152f866057b1a575db0194bcc/4938538712.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/vinimavinefarekerur.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/22107930930.pdfIn PDF document text
    • http://abpaluso.com/upload/file/pokajozibifujulesofe.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/vifetunaviku.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/popag.pdfIn PDF document text
    • http://hoacanh.net/luutru/files/mupefawomefevib.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/82729249412.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6265b4361---91279854567.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/9147150480.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/manixoxelug.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/zenatatomigij.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c65c15049---pupul.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/loxobuzokoforosofufivig.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/zasuzopisuk.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/dojibikugadojezimevitidu.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/q8ffleactb662bnn59a0673ftp/kefolevomowizalo.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/78175135418.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=mobile+airbag+kickstarterPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10960 16488 bytes
SHA-256: d0e02ea597b059e12c640018e4c0b859d2fbe31b167f59dc9fd0dc6423c65742
font_02_sfnt_off00012048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12048 17956 bytes
SHA-256: e0e54d3477c13e1fc0cafc20b9c16fa423276ca87fca62a7bc4d1860072e2bee
font_03_sfnt_off00014f62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F62 10524 bytes
SHA-256: f5ee80e9fa00f0c50202b24b77e2a0add4d4a15a536a9686c4f8e1ce7560f08a

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