Malicious PDF — malware analysis report

Static analysis result for SHA-256 b51c66e5b0bc2590…

MALICIOUS

PDF

102.9 KB Created: 2021-07-03 20:36:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 9d4ef07ac6afa23e5404f5f3e7abc487 SHA-1: f17c1335b5bdcee9a44347ebc365fa1d1cd2e3ce SHA-256: b51c66e5b0bc2590ce053f1e8e13db2f15cc8dde3e81a56ce046d388b9568be2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=introduction+to+developmental+biology PDF link annotation
    • http://ytbozhuo.com/upload/file/032305508394.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/sosegubagenemifewifak.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/25261612557.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f29a03b511---83765056320.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/memekod.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/nemofemanolakilawifetok.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/29e594013ae4b864e061aa0ef2dcf0c3/wijowirexutusukepede.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16072a353e6f2c---86599943478.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/wipuvak.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/relenowomovuv.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/j8r51vogd4d3cqtm2p1vsnglc6/dozowipelesusomo.pdfIn PDF document text
    • http://caydinhlang.net/userfiles/image/file/84468261940.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/02eadb55de419b312a2601ab9822c918/samavubojutoti.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/soziwokerapubaz.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-7-3/20210703175306831875.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/33039406194.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/78450206667.pdfIn PDF document text
    • https://olterus.com/contents//files/xojomiremo.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/59801971521.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160937fc084194---19127694324.pdfIn PDF document text
    • http://paynechapelduquesne.org/clients/9/9b/9b910c66cef3ae2d1bb1fd5804160a19/File/7402570115.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/okm9s3lp5eo1sj9skru6l8rr0b/63968123832.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/f32d3803df160aec6f52f72c8d0bf58e/92308319209.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/51939441560.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00015b96.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15B96 28108 bytes
SHA-256: cbf06fe5b1ff11c62a3a1e546d47b199aa81cab3dad00a73aa8fbd2d0a39a61d
font_00_sfnt_off0000fd7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11594 11060 bytes
SHA-256: 9a316926516bd11bf93e08fdb7f410e28d83c3c0fa028e2b140bdc1f38bbde45
font_02_sfnt_off00012ee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE0 17180 bytes
SHA-256: 1238fa22797a49055cc085f523676907d9c4c48eb29d8be3098b823a06773f0c

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