Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3f1326970a89d82…

MALICIOUS

PDF

77.8 KB Created: 2021-09-04 23:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a54e32b393aa00211158ce2400aea701 SHA-1: 4637a7a5444cf3a835da28f5fb422a7302879cbe SHA-256: d3f1326970a89d8240323512a707d079db942f2b4f0fcd1850b96f8879cdabb4
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It includes numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to malicious payloads or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://mdbim.pl/ubezpiecz/obrazy/file/85586617320.pdf In PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/b39e1cd69b6f93965067d6c640ec42de/5721502742.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/iaotfkd5l442i9npkhc2cbn5j3/1556069938.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/a76dbe89e434f720482d221179082e43/21007121644.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/72347744561.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c85b3e62232---pidawasevunad.pdfIn PDF document text
    • https://coluer.ir/documents/file/nesonutup.pdfIn PDF document text
    • http://pasted-radio.de/web/files/bapujak.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/669959b9eb2fea9b4d2e2d327d0ed54e/dinadu.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/wutazum.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/23fb1d2136d948ee0ae59e72fdf12252/suwuse.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/d90727cb8afa87e25d25018ba2ffb157/7019957701.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/9c7ea7fe8e8c8d1752ac4edb992f59a2/zodisirij.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/jiviwifitelutopojilixuzil.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/pidiwupuzuta.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/ce95b796eb079d18f7dc435bcbecc637/75729167279.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612c48ea51e82---xakimapowuxozerun.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/84040267645.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/bbg5g7pks7h1haccb5ikfm1c6k/37678118892.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/60539128006.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/8035abcfea11aa6c9fda5b5b97019d04/30987608653.pdfIn PDF document text
    • http://3q1p.com/upload/file/210625023807718751095pu5pntrmz.pdfIn PDF document text
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/wamijegunokuf.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/19659190935.pdfIn PDF document text
    • http://belean.pl/userfiles/file/3747315739.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=new+york+magazine+pdf+downloadPDF 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_off0000ccd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E9 10904 bytes
SHA-256: 11dd7021c93f9e7dae2d36d311deaa33ce12e15b9b756fac4a266e868ae9d96d
font_02_sfnt_off0000fdfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFC 16652 bytes
SHA-256: 1aea052d3d206cc6857105d3833f4d74abe61fdcd52c598c51f43d2b6d0d8997

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