Malicious PDF — malware analysis report

Static analysis result for SHA-256 c907d853d672b305…

MALICIOUS

PDF

94.6 KB Created: 2021-06-28 09:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 775d73b34fd3e4d60fb6ac86c9bfc911 SHA-1: fe05b28611a018595fa890d8ce6ee78a21f58cdc SHA-256: c907d853d672b305d031d07b52141769c50844755d77abdd030a2523bde670ef
164 Risk Score

Malware Insights

MITRE ATT&CK
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 multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985ba8bacf5---logunafubeminej.pdf In PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea01a386a0---tufalokujuvurew.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/4117500497.pdfIn PDF document text
    • http://cuacuondaiphuc.com/upload/files/58282147390.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbae7f33fa---56123516831.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/9c81265792c29a9307a097368f8c95e9/38906897447.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/gowusojawufeve.pdfIn PDF document text
    • http://webdulich.com/js/ckfinder/userfiles/files/silaribuxevu.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/7ca04021a7545ba549398367d96a8cdf/82334944080.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607361a8b5321---fumodenerezesakamobolovin.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/86754b94361fdc506d992f5e34cf478d/29197688077.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cd5592e61---21271789431.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/bofoxenamozumitid.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/xomifubasabof.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0bf486263---54769859446.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/d800b2f5f665509df896e0b3e17ee4b1/75083154498.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/a07f38c3c3d038de66035f0ae50e94f6/nulavo.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bc8578462---jogaxegolosokovodu.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/bugubilawunudaz.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/25333651505.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d0ed449fa---sewewokobixerawenisinimi.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817993be14b---71457942337.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/tomow.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/pawenuzezilegidu.pdfIn PDF document text
    • http://catgarner.com/clients/873270/File/rabupisivakeva.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/254c62f5089ae90beeafa70b3fc0a36b/99360025331.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=hello+in+5+languagesPDF 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_off0000ff9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9E 26288 bytes
SHA-256: 760c87432ea06fb4592845a0a5cb924fdbd266b6b48f1a8f6c3dbc0ac10eaa4c
font_01_sfnt_off00013c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C65 10308 bytes
SHA-256: 729538370256dfde422f4524fd319ffa634869b99465ea11701c5bd677ecd0bf
font_02_sfnt_off000153bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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