Malicious PDF — malware analysis report

Static analysis result for SHA-256 819ae02ad191a236…

MALICIOUS

PDF

74.0 KB Created: 2021-09-16 15:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ceccb79270dc0832139ecbd14acebd77 SHA-1: f694978a12e5bfae2636023d452b0b944739ef21 SHA-256: 819ae02ad191a236d560c91f8f6141edab188c18108fda8c70d86dbe52764b83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm designed to redirect users to various PDF files hosted on potentially compromised websites, masquerading as legitimate downloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure suggests a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://beta.nhatthiengroup.com/files/uploaded/files/jexuletenemovulivevoliji.pdf In PDF document text
    • https://sistemagestiondpr.co/userfiles/file/12626945428.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/76872344287.pdfIn PDF document text
    • http://garderoba.sk/images/_file/69892209141.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/94570898800.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/863dbc41786bf0b4cf09c840374596ab/59444364488.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/31051590045.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/2ac2b39635d6564600ab9bb102f30f5b/remanigenob.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/gokenido.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368740e2b93---sapijejunitufivon.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/wigoxidanekelu.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/39794491649.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/8deb025f18e45843a1e53faef9bdaf1c/58724894574.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/doxuvipifugudapetuk.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/bepubugisup.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/93838263164.pdfIn PDF document text
    • http://xageunion.com/userfiles/file/67085907302.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/rotimopenesopawima.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/77569369130.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/gevanuzodikexufezaz.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210912222256_mgueot.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/5987951636.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/59232551879.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd4f7a7f3e---lamazaxiwabisa.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/11307765551.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=monster+truck+game+download+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_off0000beb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C7 11036 bytes
SHA-256: 6fc5d2f8d3a39defb00bae9dcac83374b263a0af27fdab06e268aebd8b3a51af
font_02_sfnt_off0000f05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05E 16400 bytes
SHA-256: db1a156af509023c253b0208050f224fbb59230a919383689f197dd90fd73a8e

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