Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd5eb9414957b3e6…

MALICIOUS

PDF

68.8 KB Created: 2021-09-24 19:29:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e36d73b540bf4431f381e7e70683c08f SHA-1: cd8743a58a6846d2a50ba7b8b2a30ad68dccae32 SHA-256: bd5eb9414957b3e6409bafe5e32be94964f0bc0a9dedc71b32b177546920f1aa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The document also features a link farm with numerous external URLs, several of which point to compromised or disposable hosting, suggesting an attempt to distribute further malicious payloads or redirect users to phishing sites. The presence of embedded JavaScript indicates an intent to execute code, likely to download and run a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://moonlightmontessori.com/upload/files/lokijegalijujemixe.pdf In PDF document text
    • http://optikametuje.cz/userfiles/file/15849421815.pdfIn PDF document text
    • https://natinsel.com/imagenes/file/58121713946.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/gopemigukexalukivagib.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/bepelekofurukifaxegibok.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/wevosara.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/sutuzulurisatogebabafejok.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1a0725120---muvavujizikerulezo.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/56377363936.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/minuzaledaxu.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/1b9419237501e65e3a13788f1ddeb377/wibudos.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/68371237562.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/58694560338.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/94129142047.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/wipuga.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/8c90799cf1434b11a8866b54441f0e84/nukoleruwedowexo.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/buvaretuluperipum.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/dirarovugijuzejurur.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/pesezaletatarilobomefibek.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109101329064684.pdfIn PDF document text
    • http://terfigyelokamera.info/files/file/61731562365.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/xebomelezuvolomegivagis.pdfIn PDF document text
    • http://medicareclinichowrah.net/faboriginelist-braj/userfiles/file/sonosaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=karnan+full+movie+in+tamilPDF 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_off0000aed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAED2 15704 bytes
SHA-256: 352aa67e702f00c9e5d042cefa0a65b0733051e01431e3ade5decfa29f35e813
font_01_sfnt_off0000d69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69E 10364 bytes
SHA-256: d666cd98c6ef06faf2ac7e98b060c0e54bad6857d83233ff4f9c2f94fc331cfa
font_02_sfnt_off0000ee01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.