Malicious PDF — malware analysis report

Static analysis result for SHA-256 b56788c7e3f60c23…

MALICIOUS

PDF

71.9 KB Created: 2021-10-04 03:22:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4d28485295da8d32892591801a5359b4 SHA-1: 1f736cd91fdd4742017fee9227378a29c03a08a6 SHA-256: b56788c7e3f60c2372fd25d765241862705ed67f7ce3b974ba2312c0e3659573
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the heuristic firings indicate an attempt to exploit users through deceptive links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=example+of+application+letter+through+email PDF link annotation
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/d13913076ff93692af57087675402608/27282296921.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/vodobipagix.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16142247cad7db---naxedizekaredis.pdfIn PDF document text
    • http://bikaji.zohukum.com/ckfinder/userfiles/files/niloronogokod.pdfIn PDF document text
    • https://shibbirs.com/media/files/lilunonosudefeda.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/90145509856.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/fomuwutaverezefadetu.pdfIn PDF document text
    • http://mikol-styl.cz/userfiles/file/lubomajidezeposap.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d5a90b9bd4---80193964893.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4922bf349---kokusosotakafonijegum.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/161464d6ba7a12---37062947313.pdfIn PDF document text
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/fedejorafomesofus.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/wupokexawuredo.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/pafimikoromuge.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/96417759839.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613acbc6bf0bb---32963261779.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/loxajewupolenudi.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/45991590338.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/63918047970.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161533b6a1d031---pesizusotuvurodejaz.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/87243660748.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/tefalamefi.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/vevelodibiru.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23590039016.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/disapuga.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/zonitixolidimakurumezir.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_off0000b72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB72F 10944 bytes
SHA-256: d324d4d544c2e2b95bb54c82a9d443515779859299c1e32d45fa2592513f63a1
font_01_sfnt_off0000d052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD052 15920 bytes
SHA-256: 117418308756d8a78aece432f580d0ae6a75b9684ab826939014709cbbfe662d
font_02_sfnt_off0000f91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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