Malicious PDF — malware analysis report

Static analysis result for SHA-256 96865537db5f084f…

MALICIOUS

PDF

96.1 KB Created: 2021-06-28 21:21:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 75e475687026ae99a8ded44ac3cc1032 SHA-1: eaee1a2b7c10925cd01694a7fd6bf0c21da370fd SHA-256: 96865537db5f084fc1aad2e6a0714a3abd0b7fb6c44fb327f6942013ffe79e54
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. It also functions as a link farm, directing users to multiple external PDF files hosted on various domains, some of which appear to be compromised WordPress sites. The presence of JavaScript suggests an attempt to execute malicious code, likely to facilitate further compromise or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://jnafarms.com/clients/864068/File/dimoxuxa.pdf In PDF document text
    • https://ratsimae.ee/media/contents/file/96838910325.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085da4b93fa4---2600087256.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072e49d3fa19---78234786734.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/zavawomamokamobumubifux.pdfIn PDF document text
    • https://migger.dk/userimages/file/14288380197.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/8mv0jofod80d91n9k6vamco670/wuwawibokonozenomow.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/nuxijaguxajozikuf.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/54105840735.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2722f77cfa---58267613471.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/sg90uupel4npgi3dvpvjh3tb5h/9615069926.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/fa23452c28fe2767fc1904bf089972ed/99218897989.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/690736834608e08e481665.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ce0735ccdc9---tinekebiritesilumolo.pdfIn PDF document text
    • http://nomaquito-travel.com/editor-images/30146744549.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607587fe8f0c8---19598526291.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856bf3248d0---fajuxuvamajemiwafosotafa.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/kafijul.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/9d4cd0752e24d525c2422feaf33db42d/xosegututefawukapavera.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/43767244481.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072091380e6f---xefejadavikokena.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/20755864940.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=volition+in+sentencePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDB 9928 bytes
SHA-256: b5efecf2e3e7402fe93b3aab5d790205f025eb9837645d57ec26129461d60910
font_01_sfnt_off000113ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EA 20328 bytes
SHA-256: 3c663badb58c028066da50ec233eeb68b9667871ad3aa9c07af026247efc47a4
font_02_sfnt_off00014860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14860 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001606d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1606D 4348 bytes
SHA-256: 5ef5dca01b664ad557aae86185d0101aa5d17b7f6a158e715f36cafb3685ab77

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