Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ea8555c2ea66955…

MALICIOUS

PDF

79.5 KB Created: 2021-08-27 16:33:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 52e776e9bde04ae1560df1a6e660f818 SHA-1: 8c70e57d81e6996d0469119826d00a2565a52e48 SHA-256: 6ea8555c2ea66955ffb7481f7c684843d8df84a13c9ead64e8b43d144ffd4c3d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities. Heuristics indicate the PDF hosts a link farm pointing to compromised WordPress upload directories, suggesting it's used to distribute malicious content or phishing lures. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160895ddc905fc---febokuzurologamimeje.pdf In PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/878a8532df35e7726ad1cb3ebba0faf6/vopulibe.pdfIn PDF document text
    • http://hasyo.net/files/file/gafetafilumode.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/09485d346d853421497491bbcdfaf714/60531669770.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/rudir.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2388a2694---zowuzugeputa.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/mesetumiliredemizatesox.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/1eb4f2a7547e6d93fe47501e520d232d/28198221292.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/70936162574.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c434ee8187b---bezukulemaguzojetuvadoge.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/nawow.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/levelidagelufifikuda.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160766645937aa---90421116006.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607066fe632cd---xurifudopovalomito.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/xixifuwonakuxekexet.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/vopuganolifajamegegid.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7cfbd2871---rakatozonona.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca93d9493e---tineloxilavalazedo.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/movologutazuguvax.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a7562707d76---pupaj.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/ketikiwaxoliverimeteduni.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bb27c791e---57754921734.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wigurowofizunadazev.pdfIn PDF document text
    • http://ruresept.ru/files/file/dopemuguvoda.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/pojonoj.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc45b86c8f---jofikawomezaxi.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d54b42d938---wisasufipazumimo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=in+a+class+test+the+sum+of+shefali%27s+marks+in+mathematicsPDF 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_off0000cf11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE723 18432 bytes
SHA-256: 305fae6a9c06d8ac71a49756d3fa64140fdf871269f0cc2e6273ec3d5336e7b6
font_02_sfnt_off000116b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B6 10776 bytes
SHA-256: 3b3662f7995ec7a50debe21232e98fca19d38b7010a0743989bbbe59d37677f2

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