Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eca15f5c8f183a1…

MALICIOUS

PDF

97.0 KB Created: 2021-09-10 18:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 00c680387605d65d09b2b4f1d42c58f0 SHA-1: e0d47d45be49c88859e51cb93042a49ac21d3f09 SHA-256: 8eca15f5c8f183a1ecec679f64cef1d204bfc49f3ac5952d2d9e0aa330204af5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The file's structure and URL patterns are consistent with a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://people11people.gr/uploads/File/49192064140.pdf In PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/967000668.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613963246fb22---ditef.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16137bd9a4cfe7---57757594256.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/rexexibivetusabifitevibiv.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/32ab70b45c810ee35608be99d6185a6a/gigemaban.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/xorezereloxiwamo.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/1dda35ef4c318808ae715db299224f8d/gozukorubepapev.pdfIn PDF document text
    • http://iviltra.lt/images/files/xurapoketabo.pdfIn PDF document text
    • http://fgosvo.ru/files/files/likagizokeronoganuj.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613263b4b00e3---vafuwerowanevesabutamo.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/73863032340.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/zazobisedi.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/foramupadal.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/25879776294.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/38271631808.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16136bebc139d9---bekimoguwubedebe.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/17001883054.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/pukexemokexiwuwe.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/3016366094.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/a46ce5833f65401f45e296f3c93ef8de/75726128462.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/kisadi.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/10845844398.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/64136259332.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=csr2+android+updatePDF 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_off0001126c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126C 19584 bytes
SHA-256: ce7c9b9cd303b4a00f536715321d549999319458457544f493e68b723ae76de1
font_01_sfnt_off000145e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DFB 10588 bytes
SHA-256: fccd580e085cc5c6a0a4b244bb1aa9d5c98b13e0b5f7efe6e5ffd20f4ca1a6cd