Malicious PDF — malware analysis report

Static analysis result for SHA-256 a476ee77f3e84b27…

MALICIOUS

PDF

81.9 KB Created: 2021-09-04 05:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fe2e6d87782c812822c52c1ab3b93f17 SHA-1: c7608609d9e9dd08c7941dcc9690061cda83f9a6 SHA-256: a476ee77f3e84b27a1e1ba95f693196aa5f3f250faa154df1dea9f48d4a02074
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to numerous distinct hosts, many of which appear to be compromised or disposable, suggesting an attempt to obscure the ultimate destination or evade detection. ClamAV and ML classifiers strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://keramann.ru/uploads/files/57610042930.pdf In PDF document text
    • http://manninareunion2012.com/clients/0/03/03b30fdf9aaeeba733afadbef254ff7b/File/4491256619.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c95cee66ee2---49338770056.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/bujevepakisigaf.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aab04216f1f---zefoputagitujevezalan.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f88f2b0096---87617137111.pdfIn PDF document text
    • https://lesura.net/userfiles/file/supapovojagiterivo.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/50365643890.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/354714ef971dc0c6b80b7c8d6ad61644/wabenulewekulu.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16095d363403e8---22348289267.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/1663649892.pdfIn PDF document text
    • http://calzaturificiocatia.it/userfiles/files/bimogupiroxewi.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/95d4f88911db04843cf408f9bc6d32d0/85967521267.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/p8ogge87ipa67g2kecaik0t7s0/75205677469.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/fopijusi.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/likosufokupemovorup.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/898039378.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/fafekowezuzuxevaj.pdfIn PDF document text
    • http://gelinyuanyi.com/upload_fck/file/2021-8-31/20210831003131971486.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/ke26j0h04740s67q3hhnclkn7q/luwulig.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/80639365441.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/48896027168.pdfIn PDF document text
    • http://cuatudongsaigon.vn/uploads/files/17124788306.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=tcpdf+writehtmlcell+line+breakPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/44e3c4d233c72b712e388d158550fa99/selekujikifafevavuvegula.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_off0000dc9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9C 17032 bytes
SHA-256: bb13c664fd90206984361d8da3b1fa8b4675a44b9f3efa8a31686b975d866f8b
font_01_sfnt_off00010924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10924 10876 bytes
SHA-256: 758d3a8890374a2b3e9949eb95752dabf1a7a29c5e24900f27eb0d0eeb99b6d3
font_02_sfnt_off000121e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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