Malicious PDF — malware analysis report

Static analysis result for SHA-256 78c08136d1e8a4b9…

MALICIOUS

PDF

80.6 KB Created: 2021-08-17 22:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1ac54d9e21d4df33c7526f0fe62b8732 SHA-1: 3c9dc77dd6a4a777b4276b6ba96c9a21f59b5878 SHA-256: 78c08136d1e8a4b98caab4cd86ec4349cc1a63c6da08ac52f155e56c55644901
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure and URL patterns suggest exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://catamma.ru/uplcv?utm_term=ejercicios+de+fisica+notacion+cientifica+resueltos PDF link annotation
    • https://fasaac.org/temp//files/lupopijimiwunaweg.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/691cb1f4b9f38c3dd9a99627ea487b9e/dezawunajudasexeme.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/959b2075f7b4cae5734f018a774ea6cb/87509514200.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/jowerewo.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210817_9DD25568B65185A1.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/76708ad1330d19c80a6cfca80d338978/vuraluwukufugixutezu.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/vuberanerarumejotawal.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/0a9fba7606530a7c792e393e364d96c5/83413458775.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/wumajobibojilubojinux.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/fomiguwawu.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/add72fb6ab8efa72113af4c910b9876f/keritesokojogugi.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5c442e40e---3583652752.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/59401962425.pdfIn PDF document text
    • http://dollreunion2020.com/clients/4/43/4392dc7a9e9236654a628da0af121bbb/File/lakaso.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607046d04fbe8---7668915922.pdfIn PDF document text
    • http://sillajen.com/fckeditor/_upload/file/woritakurulo.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba2939bb1e---kesabidoxukoxefesen.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/e7bc1a39393eb063cecc4973b2959805/66006572263.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/58768055734.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c976d8f4ac---72520554714.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021061804235973499.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/jevij.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/jfivft92iv6gopp7prqs8sm5g1/pubanasoz.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles//imagenes/jixudilazatukumefag.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_off0000d1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F3 18640 bytes
SHA-256: aa6339f2896314e2ce931179f2a5eec1d1149c854eea63ee7d176473b8d3fd1f
font_02_sfnt_off000119b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B2 10680 bytes
SHA-256: 0bdd4e0475f86657a411be9339e9c3fb827a5801c00a204d4114a03060674fd0

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