Malicious PDF — malware analysis report

Static analysis result for SHA-256 5117dff92a6fada8…

MALICIOUS

PDF

73.3 KB Created: 2021-09-12 07:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 62f3708fd6fbe2fddec82d5567893147 SHA-1: ea57e3b3a70e2db88ba3b270bd48fccc620215c8 SHA-256: 5117dff92a6fada849503be4b22770a441e5e2353017d981699249aff626ec97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of 'utm_term' parameters in URLs indicate a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the exploitation of PDF vulnerabilities or the delivery of a second-stage payload via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://irlanc.ru/uplcv?utm_term=install+apk+in+android+phone PDF link annotation
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331a65b3ff4---pawabutuxakigorobopabi.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/99623733140.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/livafatebozutokasibupa.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/51808432685.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613be546e7f32---gularozonetemijaxiw.pdfIn PDF document text
    • http://findusafranchise.com/files/files/60308809747.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/lusepo.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210906222315.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/9862c5b853224cef26bad67c795720c6/98760850756.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/furajusosaledavamuluxa.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210909_C13A280864A93422.pdfIn PDF document text
    • http://cl-pub.com/files/files/kobiwup.pdfIn PDF document text
    • http://zapatosperezcabrera.com/ckfinder/userfiles/files/82500592092.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/gukor.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/66782574149.pdfIn PDF document text
    • https://pgprojekt.pl/Upload/file/buwebubopegizovum.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/42388462045.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/38039443877.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/tiresusarafulotozulegej.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/lopezegugub.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/kuzuvej.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/55258314851.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/lizufoki.pdfIn PDF document text
    • 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_off0000bc81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC81 10532 bytes
SHA-256: de68c39248c99ca2ae94592729ab1389b8c9789c35232f1d93bc473bbd8e4c3f
font_01_sfnt_off0000d465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD465 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC77 16816 bytes
SHA-256: 36f904f36aaf4ed59695a554da8322c69c0dd367e12ceb3ee6c2a97a61d68716

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