Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd18c3139eb878a2…

MALICIOUS

PDF

86.2 KB Created: 2021-09-14 00:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2b2eaec6123b7baab616d42527c2a63c SHA-1: 885c864e93bee63385fd57038c99f28284b1d254 SHA-256: fd18c3139eb878a20a2bc9d1f24b459b91834f905c2e1cefb273e37caae2ecd1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics indicate a pattern of using compromised websites to host malicious PDFs. The embedded JavaScript likely facilitates the redirection to these malicious sites, contributing to a phishing or malware distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://auburn-properties.com/userfiles/files/zokejojegavutariragudaxa.pdf In PDF document text
    • http://registermycompany.in/admin/userfiles/file/86740409644.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/mukanagesaluri.pdfIn PDF document text
    • http://hexindechem.com/upload/files/gudifakupedejuped.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/mudatenipo.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/95769931699.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/lozabanilumi.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/jewiwopibuzexumakiloxe.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/c79be3210089bf8eceee6d42de8f7287/bizudanigolorabola.pdfIn PDF document text
    • http://faptvmedia.com/userfiles/file/17108020193.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/4525249730.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/2340224109.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/52570984036.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342bd209b40---jisuwumife.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/sudodemisuniwugifigozi.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/vstdtdk7kbotfmfvrsmrr3788p/rovakevuburugil.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/35567029815.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/85894858427.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/xuvusaramulirawegasufo.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613d623761825---78791691534.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/24370206353.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/danitulakofibifosuli.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/41372175866.pdfIn PDF document text
    • https://carlojans.com/cms/file/dolewumotetimugu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=what+is+the+recycle+symbol+on+my+androidPDF 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_off0000ea0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0C 10884 bytes
SHA-256: 3abd040106058de05b4bd612adbb4a501932e6443d79aeea1c8f5992b2048cf3
font_01_sfnt_off0001030c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030C 18592 bytes
SHA-256: 645df8fabc644ce9f3ba35423edc417037054f5f68721e761c29410fb10e51bd
font_02_sfnt_off0001331d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1331D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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