Malicious PDF — malware analysis report

Static analysis result for SHA-256 723655ed09e39f79…

MALICIOUS

PDF

88.8 KB Created: 2021-09-02 07:37:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: f0f12c9a16bf64b327b9e52eb3d31d2a SHA-1: d61fec09dbdcc4cad05d919b0faba00b1aca18c8 SHA-256: 723655ed09e39f790771659ef322cfc6aabf9b80374bc584aac0717d2ed35b87
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9764

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 http://phuocthuan.vn/images/pic/file/69684720178.pdf In PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d30bc92061a---wenoxupuvajilejorifisar.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946fde8485f---fabuwijarideligadagepe.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/3706257bd8cb949145fbad1e47e06efa/nerezaxekeg.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/podavuronipokug.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/0739acd9b5faceafeaaa104eff6c19bb/47886348976.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/av8du1e0h3aveocaa4kora7onv/50548256242.pdfIn PDF document text
    • https://12shio1.com/contents/files/13699790635.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/826764518.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/15063068849.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/ab3eug7gtc8fu58adc3smfs8t0/4686547191.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/kenoroximizipoziv.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/84726399228.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/d1d86a4ecdc84dbf2bf0275d059cfd3f/94481625927.pdfIn PDF document text
    • http://djpress.pl/Image/files/36658859549.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c596a2ff37---12874457291.pdfIn PDF document text
    • http://wchs65.org/clients/b/bb/bb65574a37642f7fe3135935df861e67/File/49253810789.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/dularose.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/satudopabored.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/josixo.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c18ab8b5374---tuxed.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/18204325425.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/8f93be229cf2bb52bcbc959708e9a0cc/jowuxub.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/24340477394.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/3101ff441cf4108854bf340d3c7859f1/43491988655.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/ae8652e6cb71676c1ef54377a2cea8ca/jeranezewum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=thomas+edison+most+famous+inventionPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F8 17068 bytes
SHA-256: 93d0514ef697be9d0bb07bedd5763e7d463b2526e0a24ab3ae8edd8924e2c449
font_02_sfnt_off00012330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12330 10604 bytes
SHA-256: 1d0fde644a1c9a93d8b1f95a4b434216ad4321a21f69f88fc6df2410f40a5afc
font_03_sfnt_off00013b49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B49 17288 bytes
SHA-256: 43fe1d5b1b7913a62c8d6e3f678a6f4cc6b5cf883c34b5d18c38aace49d50e15

Open this report in the interactive analyzer, or submit your own file for analysis.