Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9908af1eabbd844…

MALICIOUS

PDF

86.2 KB Created: 2021-07-04 02:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: df6e0694c11ba5d581cdb4fbd54f0084 SHA-1: fadd19e3ea46eff33cb01281a8e3475cd1e789d6 SHA-256: e9908af1eabbd84404eb847d1948ad9387b0ecbffead7223da311a5e5d9e1f9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 6

  • 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.
  • 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://archism.ru/uplcv?utm_term=types+of+biomes+in+the+world PDF link annotation
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160934d3a683e3---fozefikipone.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a63ada79e---63318395978.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/63217238643.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/404887736.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607c63e9eaca1---45231291659.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a1357191d64---15766912932.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/86702455250.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be211ea285---zosolazetukago.pdfIn PDF document text
    • http://telmeed.com/web/ckfinder/userfiles/files/xibujubuwinubodepinipaxa.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16082ff7c807fb---64412552449.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/vubebuwubumikunipemi.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160814e731820d---26430321005.pdfIn PDF document text
    • https://jagamimpi.org/contents//files/redilukoxozijeburolamaz.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/tcbm4te45gd7pt78k2d9pge8gq/23705936854.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e574ee1022---jevenofejoxeda.pdfIn PDF document text
    • http://www.irrv.org/uploads/files/tojegosimusoxas.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/zegasefugepukajolid.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/oom61n1p28kd3pum668kevl31o/87753029230.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/10222038236.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072ddca2b661---nerax.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608742b581ad9---8576426807.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/u562ltp51egpn0cenobrbn153n/60583758184.pdfIn PDF document text
    • http://phillipsbricksalumni.com/clients/56168/File/13215115992.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16087518d7acc6---xadiwef.pdfIn PDF document text
    • http://skikk.eu/app/webroot/files/userfiles/files/91339273290.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/b533fedf0364422ceb28576aadd00f9d/56551566280.pdfIn PDF document text
    • 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_off0000f149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF149 15976 bytes
SHA-256: 22d912137d1ed9972912038068b0094981272043c3965e65b5724d3c4af5458f
font_01_sfnt_off00011a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8D 10904 bytes
SHA-256: 1dfb8db64239f11dfc4810697fef6b8cb59217dcc8079b227ed3136fd51b4f79
font_02_sfnt_off00013366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13366 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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