Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ff6db897853d713…

MALICIOUS

PDF

85.2 KB Created: 2021-07-07 13:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: eda6a7e0af5be39c275829ed187c2fca SHA-1: 2b227380048f5719543b9ff6e08e93c0fb34f75b SHA-256: 7ff6db897853d713134a518894fac0b876bf6e067332c20eeebb18a1357abc3c
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lure users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://0965818789.com/CKEdit/upload/files/nevig.pdf In PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/vven788hkka8avo7gjfcc6doke/mupumenulik.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/kewuxifedegubet.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/eedc66f616f7eba8f3b459edddd80bdd/lanugogizipavemimemaloka.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/99926099112.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/fosudawari.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d949872257e---vivarofagoguzavowuvidosoj.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/8301244004.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80f8e6ae41---19978827633.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/17692898675.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/c5c649f50f19a8d761bec0cc0bd3de42/vikinokese.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db54a57c5b---tarez.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160d60b817262b---91877297839.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/61473366842.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/21660416537.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd455321075---tezexurubel.pdfIn PDF document text
    • http://kuppersbusch-center.ru/uploads/files/45698574701.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210605150838.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/77870707754.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8745887d54---26169984348.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/jizilenusutawosaxurakix.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/jumuteju.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/574f802a2066da5becf5497178250152/tefef.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac72c31d35f---32478728742.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=ptsd+and+substance+abuse+pdfPDF 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_off0000edbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D5 10496 bytes
SHA-256: 6c94dc972f548244e2743deeb4c693147787dcfe137e2ae7c252a36a1720ef1d
font_02_sfnt_off00011da5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA5 16320 bytes
SHA-256: c0a79a631c4e1eacf139eaf1bcd98f84934d548d9860090de9ef5fbbf2a3af73