Malicious PDF — malware analysis report

Static analysis result for SHA-256 aafdf02d94f6e325…

MALICIOUS

PDF

74.2 KB Created: 2021-09-10 15:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 31bca7709e7ce147c5bab8c3867239e5 SHA-1: faeaa49f89511fa1b82d7f4799c1012ceea5b9eb SHA-256: aafdf02d94f6e3257b319971cfeeffa6bf086f2c4e2d3377a3187723cfddc5dd
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document containing embedded JavaScript, which is a common technique for delivering malicious payloads. It includes numerous links to external PDFs hosted on various websites, many of which appear to be compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving phishing or the distribution of further malware. The embedded JavaScript likely facilitates the download and execution of a second-stage payload from one of the linked URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://queure.ru/uplcv?utm_term=teach+yourself+afrikaans+pdf+download PDF link annotation
    • http://libron.pl/fckupload/assets/file/xojitinuwodevibimonod.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/towonisituxokosipujato.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/16482916007.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/83997281285.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/96095122887.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16138f2b479c66---zudoxak.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/96981097146.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/29465794680.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/32148632441.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/96997699811.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/21740173385.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/38550467225.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/bekijoreleja.pdfIn PDF document text
    • http://proficlim.ru/public/userfiles/file/13974804026.pdfIn PDF document text
    • http://hk888.edo2008.com/com/comimg/file/20210910_153153_200.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/rijekotaj.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/7fcce5da34beab4bce0201671ee31ea8/lanugadefup.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/botopomininobirix.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/161371888936b2---livodidetisowoxodakifuluz.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/27309226235.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/46401986791.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/59210089676.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/20219101028162211.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210901210651.pdfIn PDF document text
    • 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_off0000bdf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDF3 10976 bytes
SHA-256: e69768b3f46d48b8e28388c869e2cd244275af0c1bfec467a798b1f68d302a53
font_01_sfnt_off0000d767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD767 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF79 17084 bytes
SHA-256: ea13330482a505cf176a26ffc0fbac39050ef6c9e0daf90b67825252c2ee2db4

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