Malicious PDF — malware analysis report

Static analysis result for SHA-256 1eeee16506a3d98e…

MALICIOUS

PDF

85.4 KB Created: 2021-09-17 13:37:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2374b812320d32fd1baaacd15d315bb0 SHA-1: 5f2320201fdf771deec4b9cd8f2ff6899e1c34b7 SHA-256: 1eeee16506a3d98e0ed0819fb69813d0a775300655be3d116bcac2bd44473883
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file contains embedded JavaScript, a common technique for executing malicious code within PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely downloads a second-stage payload from one of the identified URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/saseju.pdf In PDF document text
    • http://papienbanana.com/user_file/file/74699099878.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/9f9761c506020e318f7c9a6a2a44d92a/jesujavib.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/58085546750.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/sorojewa.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/40951037923.pdfIn PDF document text
    • https://alexspa.pl/userfiles/file/163680436.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/a3e9f019bb8e0d02bc75d273512c467a/80950980293.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/50749721928.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/vibowulepikizeleburimewix.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/70700411793.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/vijelajofugonolavegu.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/11247477903.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/majufikaguwukoxukegoreto.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/14110487754.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/5jkqa7v0jrpll0pj24m5aei3r6/25414800666.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/fizurikekotokakidofivowil.pdfIn PDF document text
    • https://upaspor.com/resimler/files/73948470009.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/fiwokoluje.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/59239420404.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/ruwuwukebobumirujoxorazo.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/41989363069.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/poxetukujuvir.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/39410790755.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109151619333628.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=sims+freeplay+vip+15+mod+apkPDF 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_off0000e403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE403 10988 bytes
SHA-256: 28af83b55cab3c77d9941e301d44a29a1264b66215cb3833e6027dc714b8cc44
font_01_sfnt_off0000fd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD98 18960 bytes
SHA-256: 374044c73164ff1656a1e4838a39d92a82020d46c5f2311b2e21f8b27e23754c
font_02_sfnt_off00012f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1