Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae3ceb6bff3cf4ac…

MALICIOUS

PDF

85.2 KB Created: 2021-09-20 17:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 41108c2960455f69c0324f6e24ba2f8c SHA-1: 64e4286238cf9c501c871e80bd0b4e02ef4448df SHA-256: ae3ceb6bff3cf4ac43770378e9593b6fe04458176b26f811b40f1002b1c91f37
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and a significant number of external links, many of which point to compromised websites or disposable hosting. The embedded JavaScript and link farm structure suggest an attempt to redirect users to malicious sites, likely for phishing or to download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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 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=instagram+story+viewer+anonymous+private+account PDF link annotation
    • https://chief-moving.com/editor_upload/file/12935634307.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/a640abab1a15ae374a4d1a311d57bf9a/bedasaxigojelunixit.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/vesijezusumawumobepojelun.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-9/20210909231406399820.pdfIn PDF document text
    • https://mentormedya.com/files/32550689018.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/supigerovifigomar.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/90050605347.pdfIn PDF document text
    • http://signauction.net/userfiles/file/67720352619.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/fipopebojodamusesegabed.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/kopafabelibuba.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/n5csne86q54gg03r0hncrthgc1/dejatilesotatemukunu.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/5942640013.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/vibewatulazaja.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/27168251478.pdfIn PDF document text
    • http://tongshengchem.com/ckfinder/userfiles/files/91142503091.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161371a0d53095---wotavujik.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/xovuzifil.pdfIn PDF document text
    • https://medius.sk/userfiles/file/tasezizixagasaramumej.pdfIn PDF document text
    • http://thecuriosityshot.com/86146629166.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/bozajegokorasodes.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/wenizopatosa.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/20317046303.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161451ecf3ada8---3823053270.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/xewokigosireketugoj.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/36558499819.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_off0000d981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD981 22900 bytes
SHA-256: d887d6feb33ad70258f1b02ac6d24b0ea830e4fe30e27b4d0c8125574911cef5
font_01_sfnt_off0001157a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D91 10988 bytes
SHA-256: 21cd8b0f53038f7b20e647c731f2e66c030761ebe9c4d39708b41317e576c7e0

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