Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f6d3ff01122a077…

MALICIOUS

PDF

77.6 KB Created: 2021-09-03 22:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a95674a84478c1c5857efea0856a4848 SHA-1: dea9e6a9c4edf7df7f8f63c09b1721c8c499445f SHA-256: 2f6d3ff01122a077b150263360ed26aacfcb55c813c393dbaf73c31a0cf03d5a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a link farm pointing to multiple domains, some of which are hosted on compromised WordPress sites. The embedded JavaScript is likely used to redirect the user to malicious sites, and the link farm further obfuscates the malicious infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://manavpublicschool.org/manav/userfiles/file/raganuwoguwesevi.pdf In PDF document text
    • http://siripanyalamphun.com/user_img/files/sireruj.pdfIn PDF document text
    • https://songuryazilim.com/calisma2/files/uploads/62280870392.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/vukn6lv25rkc44oqomb3i70171/bitenamevasewaxa.pdfIn PDF document text
    • http://skncn.com/u/files/18982692248.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/52716664655.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/b92eaa89960128b81d001e7e48370b27/mibexoviviv.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/86135731307.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/74993253748.pdfIn PDF document text
    • http://napiarsaigh.com/images/sugamerorodujowa.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/gijarewapotupozorukofedo.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/zixijik.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161269fd39306a---33887434861.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/wosefesupifararit.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/60743409881.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/dugipapi.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a51d412112---74356143188.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/37240138328.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/xefaguxosugepib.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/gizasefujefavewok.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/15454219060.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160890521a3778---41414693142.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/xugowosemo.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/74232123324.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160fb42288904f---gefobedepijikidobez.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/dft1v1fkt7linq9ism9n6iv1tg/naxupobepisufipojedi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=poptropica+english+3+pdfPDF 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_off0000c4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4DC 11072 bytes
SHA-256: 98371b6a29d9e0f3322a46a0cdcc2ca00fd603e7dfe888238921d0b2a881949a
font_01_sfnt_off0000de6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6A 19148 bytes
SHA-256: 51094075a22159efd1f831b77704c4331bfa34c9f71b579aa0ddeabc47c0b9ce
font_02_sfnt_off0001107c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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