Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0e33913fc9667f0…

MALICIOUS

PDF

79.9 KB Created: 2021-09-07 15:38:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 821c537cbad1f8cc954075e20ac1adf3 SHA-1: da4f910f2bbb6a68062c1cbc0c7001c379d7620d SHA-256: c0e33913fc9667f0ddef565ec21b766e3cfeefa0b12dda625a3a026fa2a3faff
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a link farm pointing to compromised WordPress upload storage and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a second-stage payload via the linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://angkorphotographyguide.com/userfiles/file/mokijev.pdf In PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/51208785672.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5fb041e553---42781768789.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f378cbf358---mudukokuruxizeronunarajod.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/83631989015.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ba6156e46---88723930472.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/binudibokes.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/97296375098.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/65682607012.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/a3756bcde6a6419c985e78c15b1130a5/zabonabok.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ca1e10c9eb7---fizetigoge.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/u29g42oovunop4o8i0r6sn9vjl/61519562290.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/2ce22be6dc2ecdd335b20b3d716561d2/numelulu.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/31493953122.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/60777104087.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/vomasumojiwike.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083dc0a68fcf---54362138891.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/xozafamuzupavupoxurad.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/53650162220.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/44a5ade0b1d160b3df45412d38bdc105/14347708374.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/67830345938.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nuxovolexidovi.pdfIn PDF document text
    • https://alibabaoman.com/basefile/alibabaomancom/files/golukakukironafibarepalub.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5336f478d4---tudinuralazinevitutef.pdfIn PDF document text
    • http://anpo.vn/upload/files/bokikisusutejukubinade.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/mugifu.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/dewatitomefenotafasofid.pdfIn PDF document text
    • https://visualarchive.bg/files/bukekaropitif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=us+coast+guard+addendum+to+the+national+sar+manualPDF 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_off0000d211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD211 10924 bytes
SHA-256: 3479277c7e5c5182432f61f1a8e72c43a8107a8687ce033625a7c3ce73f7d393
font_01_sfnt_off0000eaf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10307 17900 bytes
SHA-256: e280285693b9b1a53701bd9d5623148a95204de4578bd7f67b5e38109e0ea7de