Malicious PDF — malware analysis report

Static analysis result for SHA-256 70b3ba5a5659e417…

MALICIOUS

PDF

127.3 KB Created: 2021-08-01 12:41:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fc85bf59e78f97291f742002565d0272 SHA-1: f7eb004090f5e7e807bd725bd34796dc81b9ea95 SHA-256: 70b3ba5a5659e417765e186405da16fd271a42c1f37642bcfe0f56151a298a1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external URIs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://cructi.ru/uplcv?utm_term=journal+of+alloys+and+compounds+word+template PDF link annotation
    • https://dimensioninteractive.com/WYSIWYGImage/file/26018389673.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/r7q5olng0bjdg5oktgcq8fk12sjards5/vazalefipozamedisazof.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/zawapafazedu.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c6aed559aa8---3046123026.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/53kct8u03it8i3rvibc1vvrn47/dabopunedifol.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/3j3g32guv93a914v4cv91bd3s5/fenukizidekutorogexixew.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/92056269376.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/64629140533.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/vopuwagoror.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/natumunovexeso.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160878e3853f82---jexejilu.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/7b0d31d44103b8d8f771955718c2f3e4/wijelazo.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/6b69ch74d267tlfje5uue99nl0/fowufixawotagoso.pdfIn PDF document text
    • https://avenue102.com/uploads/file/21718441047.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aef006737a---75223834864.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/dgu5u021qfsp2fhomaa1cmojt6/jirozuvumosatoxosesuvo.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/01p7atgcr0kpiict9of3mhn59u/bidafutetoxogafusegalak.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/xuwupilapexalarazax.pdfIn PDF document text
    • http://dptour.net/bot/ckfinder/uf/files/xorowikagol.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/wozirexopub.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/34954678173.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/tolakumi.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16081111b8e6f6---povonibotojifake.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_off00018bb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BB1 17956 bytes
SHA-256: c45e80e8a957a659828ab359dda7107eab5426519d3dabe1a093820def9fc639
font_01_sfnt_off0001bacc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BACC 10980 bytes
SHA-256: 856b5b6337e37e002d0b9b3aa14e71a4438797fa9d8e60bb94b8a16a64a2eac9
font_02_sfnt_off0001d46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D46D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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