Malicious PDF — malware analysis report

Static analysis result for SHA-256 dde7423df4e15960…

MALICIOUS

PDF

81.9 KB Created: 2021-09-18 04:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a833e9853fb6dcb3a4c751019dc201d6 SHA-1: 4c9bd40a052f12e38bef6b4cf26f2acc37abebd2 SHA-256: dde7423df4e15960312b7d3b721f095940d277d0eb9fef58955ee05031fdb63d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pistant.ru/uplcv?utm_term=quien+decide+lo+que+comemos+pdf PDF link annotation
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb3b18db5f---97198514348.pdfIn PDF document text
    • https://bientannamhuy.com/wp-content/uploads/files/37095613016.pdfIn PDF document text
    • http://clickvay.com/upload/files/nusimobikorogusejidegiron.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/18525337565.pdfIn PDF document text
    • http://travellerisland.com/files/55053045464.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/kagumivo.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/xutum.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/sixaxemadajixerixa.pdfIn PDF document text
    • http://zuszdounky.cz/files/66882726545.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/visotavo.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/n2ktcphtv2gip670pu1bmiqvii/borofowetegetudu.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/54049538933.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/54808912735.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/deb2774e6ded66018e2a0e21fb5f220d/39850813510.pdfIn PDF document text
    • https://mmtours.si/uploads/musuvuwimoxalajon.pdfIn PDF document text
    • http://manu-transport.com/documents/file/zodazajekiren.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/pezoguposej.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/taxopejijarope.pdfIn PDF document text
    • http://altus.pl/userfiles/file/27224636097.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1e7b70840---jafexijifajozun.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/59843660116.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/duxesewukisemokudubatufuk.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613422ef86fa8---24116918896.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/58748089543.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/darotis.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_off0000d412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD412 10728 bytes
SHA-256: 847a669985329bce53123c3ece81d5f0e285ca300abfb3a47b32a1f379d0f9d0
font_01_sfnt_off0000ec78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC78 21020 bytes
SHA-256: 0f55a3230f1ea0a398030d5ffc8cdcb7c26ad2977766c3674cf21c894a216381
font_02_sfnt_off000121a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1