Malicious PDF — malware analysis report

Static analysis result for SHA-256 f429e96f2e054b5a…

MALICIOUS

PDF

81.1 KB Created: 2021-09-05 09:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8c65d07ec7c20071e084b1a7c43b5bae SHA-1: e56dcc381afa4d3c43c356e18e42e8b5f2de95f2 SHA-256: f429e96f2e054b5a4725e8f89851f14065043df274ee15cd122333aecf409802
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, some of which are hosted on compromised CMS uploads. The document body is heavily obfuscated and unreadable, suggesting it is not intended for human consumption but rather to facilitate the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://etenindex.nl/images/uploads/tuvofopuxosu.pdf In PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/8038416cb916533ab43f15b95d80797c/90227335.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/dumefaneniru.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161113570d9288---68923799116.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/rudigijumosetigaditur.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/wuxojezato.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/xagudonenixejeladi.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210904191219.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/rowop.pdfIn PDF document text
    • https://pabxlg.com/userfiles/file/20890056037.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd68c4c893e---69787778037.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/1c35c111fd280c276b9de0b67a814cc3/61518055904.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/aucofk3j29o5n3od3brsm8v88p/kujalulatu.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/6252339185.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/54724596624.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210803013804.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/26189631069.pdfIn PDF document text
    • http://elma1.ru/!upload/files/88968144777.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f678b8a374---tijil.pdfIn PDF document text
    • https://summit-christian-academy.net/scauserfiles/files/veluvixugogobolanezigup.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/17092780681.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/63690024118.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/1e352f773c9847c9bf582b780cba43c9/rudopexox.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/wemosufu.pdfIn PDF document text
    • http://waterreducer.cn/d/files/94134908243.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=ashton+manual+benzo+withdrawalPDF 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_off0000d8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D7 17372 bytes
SHA-256: 6852dec208120fac59917776534fdeb6b15fd550d9d15dffae10cbc3eba4fcfd
font_01_sfnt_off000105ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BA 10880 bytes
SHA-256: 9bf4298b0c7a00ee7518474bdc6bd3b073af8fef0456fc86ba6e22fac5aa1679
font_02_sfnt_off00011ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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