Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8577459146a895a…

MALICIOUS

PDF

90.7 KB Created: 2021-09-02 00:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: db6455f8b10f73acbdd633fae986757b SHA-1: 1e228262d1ed8c2d3b42ff47db4d523a848eb329 SHA-256: e8577459146a895a6879269bfec122f33e07705af06e1430dc03e0cebee8c6d9
164 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 executing malicious code. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites used for hosting the PDF itself. This suggests the PDF is part of a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160dda097b75e4---mogosejagakasegadepiw.pdf In PDF document text
    • https://studio-september.com/wp-content/plugins/super-forms/uploads/php/files/6b3262c1c1be14d4f719e04c17051f0a/83049384359.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d19749654af5a61bc43c01a2706ba521/77305269644.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/2c3225b8a561d6d9ef939850f9f71586/wovusiwil.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/91402973379.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/pidifuwumuvil.pdfIn PDF document text
    • http://etre-belle.su/images/file/92286875887.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0606b6f56b---lopipofuw.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/biwizuridovazuma.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/50976087848.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/09d7bf9f24dfc4cb65b9658255f691a3/29022231883.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/22137032164.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16084efeed4e46---puremo.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/dusufitexipowozimujerax.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e99d6069a---51674802715.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/vugavuzefu.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/vurodomodifawuxedijov.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/ed6afcb4fcc389d4477089ce034459ee/xurezuzizemidegirexozan.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16127442e36727---77878830657.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160837cb6dbc01---8007434920.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/kudunigarugipuwojul.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/37448855133.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210728075134_k0gz6v.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=fastest+gnome+in+the+westPDF 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_off0000fd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD18 10472 bytes
SHA-256: be937352205e9ea8600f8feb51aa5d21cd8776b82e17077ac49b7e15f2a5a317
font_01_sfnt_off000114c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD5 18324 bytes
SHA-256: e0cea2f499b02296874f7a88a9f7e1b2997ad2786e011facaa16cbb4be1f894e

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