Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dc39b47b2c34682…

MALICIOUS

PDF

99.9 KB Created: 2021-08-05 09:18:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d0c9e4bc317c4e6f7f7a929061ce838c SHA-1: f0b197e78caaa793379565b0eb882b5ade761dcb SHA-256: 5dc39b47b2c346823955ab022594e26f4dc551256ec8e9123a5ab5683f41b689
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://audreyheselmans.com/_files/file/mebifelatapag.pdf In PDF document text
    • http://alhouti.com/userfiles/file/minazejobijokojivinuf.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80aa4f2e26---raxomofanov.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/29127414950.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a712417e39e---rimudefetamafumus.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/majisarawa.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/23qikgpv3bvv3sfs3b5d725q43/dulibakizuzewanitovujov.pdfIn PDF document text
    • https://coil.hk/upload/files/37947309470.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de0a4d73527---rexolobazabus.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/36159914357.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/3119710280.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c36ec9ae76c---14226578774.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/846c407dcf5794f9c10151e45cf27bd0/dibewivanefumujibezere.pdfIn PDF document text
    • http://gphs100.com/clients/e/e3/e3ed30f4e85b1ff1e74f61348c82e8eb/File/52445793081.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/55149330834.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/57862974273.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/7dd115e935566d33bc5fe0e193586b0b/jaraz.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1609dede31707c---rotewad.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/9341b54d525204297000b6dfb70afcf1/25201504922.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/2e9362d14587fb0d41556a9479f33780/kadurusumiw.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/95547856807.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/27422423287.pdfIn PDF document text
    • http://toshiba-center.ru/uploads/files/79354137009.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=cyborg+full+movie+mp4+download+in+hindiPDF 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
stream_006_off00011435.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11435 20000 bytes
SHA-256: aed6373244f2bd7c1cd7da80e48b677444b65a67f91671530b29c0375caaea22
font_00_sfnt_off0000fc24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D6 11296 bytes
SHA-256: 05f416c028920f6546bb3a44f88006010b405293268890ebe13fa261800598df
font_03_sfnt_off00014fd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FD0 18364 bytes
SHA-256: 88b5b7285cdfcc6e15dd5d9a6e50ecbde82c2a78205867f37eeb4e203168791a

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