Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd6bea84cb792e52…

MALICIOUS

PDF

72.7 KB Created: 2021-09-03 23:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: a70eaf105fa7943264c9c8f6bb3beee3 SHA-1: e978bd572ba78f705280b7c7e27462caf4e4896f SHA-256: dd6bea84cb792e52997b82f445a81108c990c2fe9fadb0b07f7a2b9eab4e6923
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and multiple links to external PDFs, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to distribute malware. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass security filters. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 9

  • 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 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://balajitutorial.com/admin/userfiles/file/61411651516.pdf In PDF document text
    • http://gazosilikatnn.ru/uploads/files/tazibigumenatosepebo.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/moxinim.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/39127116106.pdfIn PDF document text
    • http://coffee33.ru/archive/file/zikugitefofufimadijo.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/12825518522.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/v41uqnfah1asvk2eoton28695n/25212180928.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/befuduwalokebim.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/vixadi.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/gafapujazasipinoku.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/8f46995ff65c05d19c7c76de14eb8895/27322083815.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/bo18qd8876e8tlbg76i6oj4gp5/77272380441.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/pasesonufelal.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/lesawegalegetipedimodi.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/5j47o2rta35n8e89d65bgvuj21/lanosemuxugelizoxeva.pdfIn PDF document text
    • http://gurukripapublicschool.com/userfiles/file/52983249591.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/6c5119560aa4067d06ea9e08066e20d5/wazowi.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c91b6047ca4---luviloki.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/gfeqrquvsct8r6tplh0ofj77s9/razesenafedifem.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/hfsslf4de27qi7gflq6nadhuk0/gemino.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/59553250463.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/petizuvupojimorizizikux.pdfIn PDF document text
    • https://haidangpc.com/contents/files/nonumasobadelejepa.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/71741540156.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/k2j3lfrhgrvdb30vsr6gtkhq54/jovigefivasoxejada.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=fce+exam+papers+pdfPDF 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_off0000bc1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD430 16276 bytes
SHA-256: 77a205c8556d04766c9b4389c8aae1b5f58f6b473e611544c9f34ecdc8fb81a5
font_02_sfnt_off0000fdf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF6 10400 bytes
SHA-256: ec6ef04cac70a3e0fbaa5ed230562007ce322d425f477b30a37cb6b058ac6233

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