Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c38e6848e5fab1f…

MALICIOUS

PDF

96.8 KB Created: 2021-08-11 00:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: f0363e0490c512485a7de264b384cf81 SHA-1: 81d805e132e0b344475492d04edbb0d9e996735a SHA-256: 9c38e6848e5fab1f70c91171085b10b176a650c6707cf5f67592230019f43719
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 delivering malicious content. The PDF also contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/ca5d3223e7a58e09c422084ac7e8221a/19686270071.pdf In PDF document text
    • http://shqinze.net/admin/upimg/file///64349434601.pdfIn PDF document text
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/61950301808.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/dozudanoxebixaboruvuli.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/dizesijobopuxafata.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/83394609678.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc9b1e8c64---50341574553.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/2148322984.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95abf8d437---wigubesefulojosu.pdfIn PDF document text
    • http://bougerpourstarlight.com/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/furez.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/05/file/202105240542024053.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112f332df818---55094828983.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9d4d2eab40---35685955704.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/991q4nl1v9g6vv0g8ar67j6gl3/dekudobulaxajixitepe.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/nujiwisusop.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b0m0rhvrdaukkc5cg4of10biu1/44466812410.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/74078028865.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/6502d51de531bd25ce5467aa396bfe36/4702665126.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/62918484407.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/neduxubokepifujetojuwoxe.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/36754578893.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/85665016640.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8a92cee31---sexidexozewuta.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/82369265888.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=diagrama+electrico+jetta+a3+1.8+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11370 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012b87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B87 11320 bytes
SHA-256: aca445a7b1578f1dc39dfe92b9b7ab4143864407aa3ff42fa45f8cf86e5c0cbe
font_02_sfnt_off00014604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14604 18008 bytes
SHA-256: 5806b7f1b21ab79c3645339be00ea8d6f92fe9f2c404d79f7552339dd82eab62

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