Malicious PDF — malware analysis report

Static analysis result for SHA-256 c00d5d66c29870a3…

MALICIOUS

PDF

92.1 KB Created: 2021-09-06 22:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: df4c7b0f7f452b9e563b406d326facc8 SHA-1: 9ae53d1cf9be1efede389626dfaea0c5fce7dae0 SHA-256: c00d5d66c29870a343ca901c4c3ad0db7d6955fcd956e09357a944280b3b9f56
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075fa16524d2---pipututulesojajirojejik.pdf In PDF document text
    • http://ebrinteractive.com/userfiles/file/60907240927.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/gamipomonuminawujemisit.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/poladumituvedepep.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/rupomododagufogawepikifis.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab231bc67d5---jaxit.pdfIn PDF document text
    • https://sambelteri.com/contents//files/49203915144.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/bugitexojuxegiwijeko.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/49623729292.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d54591f22---27838515903.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d1ca3367e---ramirijofaxuwa.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/59494444037.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/zujixegimugexigot.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/50553826999.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///19277709812.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/67236937582.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/73949244187.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/721364369.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cbee3772640---rosezek.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/ledibojopenodo.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6256514496---pakibiwutobivok.pdfIn PDF document text
    • https://mszukam.pl/dat//file/70195158297.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090ef3ba5298---lasoronafulurozarufosoled.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=codigo+penal+pdf+guatemalaPDF 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_off000101ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000119e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E5 10704 bytes
SHA-256: 30d7492a46802b9cae076a747d707908220e9de0074d2d0b499c30eea955e3de
font_02_sfnt_off00013239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13239 18616 bytes
SHA-256: 7187909bbe9ecb5d9199c62919ee687552fa02d75e42cd14fb1cd87c2d007216

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