Malicious PDF — malware analysis report

Static analysis result for SHA-256 af7dbdd7c8d22769…

MALICIOUS

PDF

84.2 KB Created: 2021-08-16 03:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9051c869a35804a4c9de31cda7480b91 SHA-1: cc960ee225795cdc3c8a2b435e069e931f6f9773 SHA-256: af7dbdd7c8d22769a45090a440bfd24915dc2d5eeeb80340521c386b039befa5
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous PDF files hosted on compromised websites and disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://luatsubienhoa.com/upload/ck/files/51430455251.pdf In PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/gatogiduzir.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/64922660251.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/7487075015.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/68882a69d4a742f25ca515ad84c3b2af/gigofurimajuw.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/bunapuloxabigefijixunut.pdfIn PDF document text
    • https://progin.ch/ckfinder/userfiles/files/61957443242.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d66ae4a67ae---pewokoxoxoteni.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/xidugewasuniwo.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/jubkg52gtvshv8grvq0dc94qs7/gujuzuforet.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/d7784580b1033a604516578ce5921680/xupizenimonelitameku.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/kapabefufebevuj.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/82760893634.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/fofetovasubejebeni.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f980707c4e---95070712900.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/zagodivapoladitavobafuba.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/fc72f90dde2249b96d119c6adb2a7296/1497426128.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/89821920225.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/vafeparowi.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/nivevujibapakadejedud.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/rososuremutovemixanajolob.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/fudezulopis.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/rirebo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=mrs+major+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_off0000e704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE704 17180 bytes
SHA-256: e554f48bdd359aa7fc7c9780fb463ddf0d9d71fea3581699b59d701b23a14880
font_01_sfnt_off000113ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AE 10296 bytes
SHA-256: 17cf10c2f13b4282d0f60f09df3fbeb1030a7a8e5448bef7992dd9de6e5211cf
font_02_sfnt_off00012ae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1