Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb4b578fc20e5980…

MALICIOUS

PDF

77.1 KB Created: 2021-07-13 02:28:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0ea5b51b96f2006b9a12dbc06723ec20 SHA-1: 3f9d743ffa9a6775eddaa4a14e72fe64f8ddca35 SHA-256: bb4b578fc20e59803ddeb8e43f43c4408952f67f63864c161a39882cc13cdbe5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2121209410---momefoturunogejexojebefi.pdf In PDF document text
    • https://flardochform.se/userfiles/file/vivalelamabujijajapagep.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbab64364b---zefutitagojif.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/vediwab.pdfIn PDF document text
    • https://hissekurban.com/resimler/files/95615689372.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/4gdb7q034b0uia6vi6pi149el7/banuw.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/44371348913.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/7af21130e59f0a5549463e4287f44901/51167733701.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/50696543612.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/34072475196.pdfIn PDF document text
    • http://spearsyounglegacy.com/clients/b/b2/b2c23f164518415ec8f3c1c8d0af542d/File/lelilafezexapa.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/vijavovese.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2760f04ea0---bokubojegokexi.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/d5fbe2dd3904d1d5b7f7f70c4e1b1435/zigenino.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/cbd1f7e88234fb92ad802bd2be877695/92778576899.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/2970539460.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/67298806791.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/33474050676.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a5e9016d1af59951fae9f90bee6acbc8/vosuto.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/9c11032258c2e6882ade14ceed2bd16e/kexezelowajelire.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/f03co32cbfie6t3ueh9pk9vhff/budewawirinafiluvawepos.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ed07569f1---dofiwikul.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/wisosogifidebevi.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/73384252497.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/rubowevevako.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/040a27ad993a0dfa34118b89e45cf828/fosavisaduzabazaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=909+area+code+and+time+zonePDF 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_off0000cc70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC70 16352 bytes
SHA-256: 4d574a45dfc02562edcd5d660831cd727a14ef611ec1cca6b76269ff1614b994
font_01_sfnt_off0000f6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F08 10568 bytes
SHA-256: db40d9353a285870cc26f0b6562d5226d9ed0bf7941437555ccf9db5811587ab