Malicious PDF — malware analysis report

Static analysis result for SHA-256 99dd7dc527349ed9…

MALICIOUS

PDF

94.4 KB Created: 2021-08-11 06:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 300f2632d588adf3cd776eb24bb4f341 SHA-1: 846f6b699497d7f86fb66d973b2d4029a1f09a90 SHA-256: 99dd7dc527349ed9bfaf55674522bd5160dbe36dd531e809d30c524c719e36c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct textual clues, but the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

Heuristics 6

  • 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.
  • 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://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/f17f4da7956efa82d55e91ce68d27cd4/banimetagol.pdf In PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/51871b77aab64faa6bbca84eaf215cbd/bobimemenedop.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/geduwo.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf0750434d7---sobojurewobawipasod.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c015c7847e---sisosob.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/15657555148.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/eacf00667c58289d8992e07de10cc69e/93091844421.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/k63du2e2rve3q7uitoddp24g34/pavudavuzadefamegufufo.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb4154037e---jalimefavoxubosuwi.pdfIn PDF document text
    • http://ccshecea.org/upload/files/57064084830.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/41719423277.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///lipikutepetafaseko.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aae3d281fd2---31421329380.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/45511011023.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba87509bd64---vazejawivizizesegara.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/95691501179.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/1e2ba346b6662c11865261d1dea5a235/polidosubuvozu.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/87036800506.pdfIn PDF document text
    • http://zoop-tech.com/ckfinder/userfiles/files/71759215266.pdfIn PDF document text
    • http://edumedcare.pl/upload/files/bipuginagikeverojewomu.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/57454980543.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/51687407471.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=traducir+texto+de+ingles+a+espa%C3%B1ol+por+fotoPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC2 17356 bytes
SHA-256: fb7138e79492694b93fe8ac82dce186e1815e2d931944bd80a89e7eca83e18e7
font_01_sfnt_off000118ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130BE 16324 bytes
SHA-256: 4f2a9a26ae94a9e4f3ec726fc0ffc7e1e6ed9edd0c7cee3f16fc637664c46f3c
font_03_sfnt_off0001469a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1469A 1672 bytes
SHA-256: 3f1748778f03e7b7e2d3a6c88ca15ef060a02f224cd71155e662fde9dd4c56c7
font_04_sfnt_off00014e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E8D 11168 bytes
SHA-256: c24520e5f15d240b6adbf6e6ec9da6f8f9d407993043795eea6aa85fcc165796

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