Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc9e42d6f6ccd6a4…

MALICIOUS

PDF

109.6 KB Created: 2021-06-26 15:56:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b89d2c7f14f00bcc32053addc92778ed SHA-1: 36b814ec37588a0e8dbf146a5d09726fce1d6920 SHA-256: dc9e42d6f6ccd6a4d5cb56a4be6a85c7f9ae0aaf5eea81db9d9e9956bad0eafe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The document body is unreadable, but the heuristics and URL analysis reveal the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://monkey-do.net/userfiles/file/xavejogotanabakodiveribov.pdf In PDF document text
    • http://capmar.eu/userfiles/file/90172327223.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/7822ba831c65d4c7ba612aebc8cf10e0/45153299321.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/de1h0oomvmhnmadn1fiaspb296/begegipukekivixu.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/47252008121.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/36873302784.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/40ce4b906401b6b3eb940552a6071c5e/67661456170.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/f3c0a61ed186de57238a66ab8a6f8ca9/fizikogevet.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9f05d8144---mebolurokanatixoxer.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fedaaeb892---42946648184.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0292576001621911539.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/adb9a34ffbbbc0cafd7155d36ec154fa/nurasejizedoxopesizuleb.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/efoi1akqkiphes70bbu0jsqood/52136557878.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f6ad83087---retiw.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/tunepofoware.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/e0cc30f0d8beb1d68980684184c5a82c/24019470829.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b22560952d6---14361818717.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0609/ef675c2d6f0c1f3002c901b51517e7de.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/c38g07spn5f895n6s9aokkthge/kesujevurexogavavunena.pdfIn PDF document text
    • https://cutandcolorparrucchieri.it/file/57223763428.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/3c7c209fa59d206cd28d47360fc13d93/nemez.pdfIn PDF document text
    • https://webmenuplus.com/images/file/38860099307.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/1a74c2d1eb5082f89e49b66fe0ee288b/xajanitemigisasenagop.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/abjgd46ak7hlqrp827eg1sttar/xogunal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=know+matter+whatPDF 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_off00014b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16363 18112 bytes
SHA-256: bcaf6a67487a81cffd19640014ee895dee85e901a31e17e05dd607b41b8e9465
font_02_sfnt_off000192c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x192C4 10144 bytes
SHA-256: acf7c2326c2c4f5b336691aa28975e788950a3852ba7e8622dfe36fa20e5d703

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