Malicious PDF — malware analysis report

Static analysis result for SHA-256 c60c2c450e25fea4…

MALICIOUS

PDF

85.6 KB Created: 2021-06-27 07:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5bfe961c7a7034e1bd2b647d5ed7ee33 SHA-1: bfc08c15c5b2f3e667cd2221bf7b31d2c8c595c8 SHA-256: c60c2c450e25fea48e76a44a509da63f501c1d1da4296c62dd3b30f5e5d73bd2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and disposable hosting, likely serving as a distribution point for phishing or malware. The presence of external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious content.

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 https://nomylo.ru/uplcv?utm_term=convert+3.5+mm+to+inches+fraction
    • https://nanyangtextile.com/userfiles/file/xuzajiwurumopokoke.pdf
    • http://stonebriarranch.com/clients/876969/File/38686497604.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/tjg030ejli536qgd1vlr59hse0/mojegevidakazuwejirinu.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2e3e2a71a---bevajuxasos.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/58a3e0a80df830ada00a47884d04a7f5/74915150339.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/etggh24annf0c9tscjc9p1k6i4/soxum.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bca1f69bbc5---bivijitusudutelilojesukeg.pdf
    • http://fanti-fitness.pl/uploads/assets/file/sadagili.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9780d5a99---97274987221.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/0e0c54c43ba9a96e601f4b719679d192/dixuwitipekasikalelob.pdf
    • https://menu2uplus.com/images/file/50701013327.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070364bd8eeb---nemiwomupogebutira.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160788d65e56dd---jaworudidakuxomojisozime.pdf
    • http://lubrifianti-auto.ro/files/file/76231937626.pdf
    • https://weddingitaly.jp/images/file/tibadipafar.pdf
    • http://insidethedigitaltrend.biz/userfiles/file/duxilowajojekedika.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/5tpbtqmfnbb24sk75gbv04jh7j/80361521595.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16075a03fc12e2---sedagonajikiwul.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2c8db2db7---11375605783.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a53a5c690cf---tekepobizixegilimu.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/407d8c4697fb4b0c4b4e27f79c81f765/97346356980.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ff6c93247---23519262613.pdf
    • http://commsoft.nu/demo/ktb/wsmbilder/files/nudobatix.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6c84587ac---31075243423.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e71d.bin
b494ae019bd45088003d6c1dfd5dcfabfd16249bffd92afbb02cd33a9d729d6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE71D 18096 bytes
font_01_sfnt_off000115fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115FC 16792 bytes
font_02_sfnt_off00012e13.bin
08b3e844a952d339b144e42ce15ce3136c7072cb65f8d4b94a578116ced7f512		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E13 11024 bytes

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