Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4eed3ef8de4366d…

MALICIOUS

PDF

76.8 KB Created: 2021-09-03 23:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7893c01f9cbc7d6491fe4ce808665519 SHA-1: c9a6d77e3132aee2de992f8bdb9e7f5a31a1d5c7 SHA-256: c4eed3ef8de4366dd80aa541839bbfac090684d796e349cd2e1ed911675cfb2a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic firings strongly indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nomylo.ru/uplcv?utm_term=rubinstein+polymer+physics+solution+manual PDF link annotation
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/nuwebuzebuwinisil.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/zivojejiziwino.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16088468d62fdd---77036213387.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/7154c9db0d28578af534201d322cda24/jujuwexax.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/gc71phag39liculi8fio8r0qe2/88828113311.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/l2f43vk1905o9gfep6k0h2h0j3/32474314002.pdfIn PDF document text
    • http://axwelindia.com/uploads/lulafolibub.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/30362605111.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/firipotisugire.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/ramobetagawadigo.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a96f6cf2066---93309425760.pdfIn PDF document text
    • http://taiwangallant.com/uploads//files/202108101235486290.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d75a9c2484---76732605261.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/62049492831.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f23ad48c4---27809752728.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/46994559371.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/zalugojesevizaremomizawa.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1611bc0b5a4ade---73289794036.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/pazuzusikov.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/60826e4f8ed1e92125567714e8318f01/35080640588.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a65221af4d1---rinukeruxegutumanepudo.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/54526288820.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/fegawajexumo.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/86223fc089463d534ef8277dbde773ef/39253181560.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_off0000c6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A8 17468 bytes
SHA-256: d6cd9971af4c8a3481fc8778c0b6aff15826d0a44cb3a81ce067dc354df20d2b
font_01_sfnt_off0000f3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E5 11036 bytes
SHA-256: 8a56eece4805affe86341b08790de0d10319405b70a1db6c1e88e2764dffdb19
font_02_sfnt_off00010d3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.