Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a8e1ca9cd1e8006…

MALICIOUS

PDF

71.8 KB Created: 2021-09-18 07:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1bc44b06e9768af91f88d68f8d7282d1 SHA-1: c3d99a626a2ce4200d4afd52fc75167bce40c290 SHA-256: 9a8e1ca9cd1e80060547a5b4e2537aaf0e272ca88a9d97cc82ba4deceeebc47a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://allytemp.ru/uplcv?utm_term=job+satisfaction+definition+pdf PDF link annotation
    • https://jeanmarcrobion.fr/userfiles/file/roviwabotuna.pdfIn PDF document text
    • https://prettygreekvillas.com/admin/fckeditor/editor/filemanager/connectofile/22228006698.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/nogosuvu.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/xufoza.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/82769357348.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/1577700730.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1614251b22e1dd---vorekopikasedan.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/ek5f7vtgm25unk46rbsajmvivu/biwafasuneloxepabagikem.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/46769794217.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/70069313657.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/sobivudorataroxizukolo.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/8349961367.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/vusagawut.pdfIn PDF document text
    • http://linker-apps.com/files/37625729330.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/nazozu.pdfIn PDF document text
    • https://mbbs.hr/files/13049453638.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134f90fc2e4e---xebipunafilenoxowad.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/kizopes.pdfIn PDF document text
    • http://vhz.cz/user-files/3638868462.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/30519602854.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161453ffcc1a56---84292327755.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/8476481205.pdfIn PDF document text
    • http://ossokahve.com/upload/file/nepujapudesor.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/vavunigavojaxabuxuw.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/65931173815.pdfIn PDF document text
    • http://dodogs.ru/sites/default/files/file/40405884313.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_off0000bc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD453 10596 bytes
SHA-256: 7b02facc53852b2317950005707a874794ce46781089882f56f91a6cd148429e
font_02_sfnt_off0000ec81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC81 14612 bytes
SHA-256: 35c5e4a96813f55f5f306d60bea2fe8891aaa685e459eda467420331b6f1dff7