Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b96d89306f560a1…

MALICIOUS

PDF

78.9 KB Created: 2021-09-09 19:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f9c475a0d6ba33b8468ad02807b2398e SHA-1: b5a2a5c8196007c616e7ff3b2e58502449f1845a SHA-256: 4b96d89306f560a118eb41533f21d537c7926e2abe2bd7ac39f0b5863ba2b619
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on potentially compromised or disposable domains. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate attempt to obscure the true malicious destinations by using a large number of distinct, low-reputation hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://alocainghien.com/uploads/userfiles/file/92625632296.pdf In PDF document text
    • http://gldbirdgel.com/user_img/files/gajadegos.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/netezovigenodiwiranatun.pdfIn PDF document text
    • http://fastcredit.ge/userfiles/file/bomok.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210905_143633.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210905_B6BCB04C1905AABC.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/12467687296.pdfIn PDF document text
    • http://orenprom.com/img/account/file/nufefuvexod.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fea6756a2a---62473774295.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/tutusegimuxi.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/fizizimobo.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/10694869053.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/tinateroduxoludowod.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/gozemaxowuk.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/74383586505.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/tedemazifinovokoligofose.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/13345998604.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109011120387859.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/xikugekijumaratimesubem.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed15758503---josalo.pdfIn PDF document text
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/21264712580.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/bapagogurolikamudukowu.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16130585106d50---51797997597.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=cupidabo+app+downloadPDF 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_off0000d230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD230 10244 bytes
SHA-256: 1b131e23adb9d8798f91d2a29c6fcc7d12068f9b6bc89a578d0a65456f7503b4
font_01_sfnt_off0000e911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE911 17680 bytes
SHA-256: d664e3c82767b83192682e6ceb2f526fa6c7a5ffca86f2a26089f5b824b11e51
font_02_sfnt_off00011675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11675 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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