Malicious PDF — malware analysis report

Static analysis result for SHA-256 2157aee6fd1de8b6…

MALICIOUS

PDF

83.0 KB Created: 2021-09-16 09:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3dad45363dab0cf83d46e28c24a77e56 SHA-1: aa8f2bd15a784ce066eee0de142b5789457adcd8 SHA-256: 2157aee6fd1de8b617f518770a126e904cc10763379d7aea6c9e6b7dda640788
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress uploads and disposable hosting. This suggests the document is designed as a lure to redirect users to malicious content, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://beta-rc.com/upload/files/gekejurexumo.pdf In PDF document text
    • http://yigang-lin.com/uploads/files/202109140024567426.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/10131970226.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/47619816183.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613a269258f8a---79406300419.pdfIn PDF document text
    • https://ppntassone.it/dati/upload/file/bimowirexazal.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/eig51o6td0qhr4i015qdmtbc0r/7581558593.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2b2ecea51---46317566692.pdfIn PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/dirivoz.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a45cbb7360---dunataze.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/rimegepi.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210906205402.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/ridesasi.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/satudafigawewuxa.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210909201509834216.pdfIn PDF document text
    • http://upakuika.com/img/file/dujizazudutos.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161351f7688843---foxafotapijikededifi.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/lenexojijurixe.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/11150255020.pdfIn PDF document text
    • https://dom-titan.rs/files/89317624029.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/97578862817.pdfIn PDF document text
    • http://trivio.it/userfiles/files/36255769281.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/161409c246295c---59685892852.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=mutilate+a+ragdoll+1PDF 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_off0000e188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE188 10296 bytes
SHA-256: a70c17977b8b8ed91b81b447f084c3e11d8fd7f9daa25f86a765224f936629e6
font_01_sfnt_off0000f8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B8 17548 bytes
SHA-256: 85e441b95ef4b6e75ed481b1fcbf821171423165e7f05b5142fe4446bc5ba0d5

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