Malicious PDF — malware analysis report

Static analysis result for SHA-256 20e051c05c9ada84…

MALICIOUS

PDF

83.6 KB Created: 2021-09-16 10:35:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: daf896ed4229f507cc026aa85bb1e310 SHA-1: d65e3d2d895a2d7a450bf4dc88b7462fda5aaa79 SHA-256: 20e051c05c9ada848b3f76544e5e0f7d44f88733f8fe242499d8b27be63bb915
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer, likely to facilitate further exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/fe70722da8df973f5dce142c5c69d5a0/jefisifununelapem.pdf In PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/76820400538.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/29391573373.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/57802179901.pdfIn PDF document text
    • http://www.pratikchoudhury.com/fckimages/file/vanilowonelik.pdfIn PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/91951770425.pdfIn PDF document text
    • http://hidropro.hu/upload/zovifuzegumeg.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/mevaxarugalowi.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/2424de2de7c0e60698f17801abe7d861/14552982988.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/56009236748.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/sifokixitib.pdfIn PDF document text
    • http://janaturismointegrato.com/uploads/file/dotefuponosemigig.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/ziniwaxubewus.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be598885da---pagazasanon.pdfIn PDF document text
    • https://afayl.com/userfiles/file/76503154200.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/73005942979.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/jodukajevoxabeviturigo.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/50671100389.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/61834623585.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/74604978892.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/rekugesinavamatupu.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/lufuvodibefilurewa.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/76417809025.pdfIn PDF document text
    • http://0851gay.org/userfiles/202109file/2021091419250470554.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/kazuvem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=mlkit+barcode+scanningPDF 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_off0000e1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D8 17720 bytes
SHA-256: 9a434db26c8691668454aa5c986d9f0fc60d55ac795ccb613cf5113e140511cd
font_01_sfnt_off00010ff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12807 10768 bytes
SHA-256: 7af1ef0d208840b63d8d549f61743978d8c18809e87f3b518a20a18424cc49e4