Malicious PDF — malware analysis report

Static analysis result for SHA-256 7105d7fc85267a2b…

MALICIOUS

PDF

76.6 KB Created: 2021-09-06 23:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f6d5651bf05a3d16f61d7f22df7520c2 SHA-1: 5c70eb95ce025657d53f23392ab188f29dde4259 SHA-256: 7105d7fc85267a2b296e2ce5fec55e7727908461232fde1c9abd74fc88787465
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, indicating it functions as a link farm. The presence of external URIs and a link farm heuristic suggests the primary purpose is to redirect users to potentially malicious content. ClamAV detection and ML classification further support its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://krisoc.ru/uplcv?utm_term=cardapio+cetogenica+pdf PDF link annotation
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/iqoucu2d1jlp9umcudc53g869j/2745295352.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/35f4e61e835c7cca26413f7fe0e04309/pegulon.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/23793778707.pdfIn PDF document text
    • http://vo23.ru/upload/file/80301576503.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/42fd989ec7e4065e0bd8bd5a670fe530/71381082652.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/4noeun1beiikl5kt8bqc8b0fkf/walalofojabewu.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/96568917729.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/mekapa.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/ld3a320bmki1ts1b542d11o70h/16537314734.pdfIn PDF document text
    • https://granitnet.hu/editor_up/85486954960.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c03c32e7909---56662795344.pdfIn PDF document text
    • http://teaandtiara.ca/clients/c/cf/cffd5a667a547ddf6f7ed7e454f715b7/File/50418875565.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63251634c6---85689481710.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16109c91d6c2c5---wofevikulazesumep.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/4f730187808afbff212a5963111f916b/ruvetuwapeg.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/dazomapidar.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084afa70cd97---29539944967.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b05c3f22645---33111830557.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/13220220503.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/dvpe9oannefcg4qur7nm42knv1/88673733234.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/89854400341.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/b49d8edaeb861da3cd660a69bffe7ce2/tiwulelodikadexabenububim.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/90574331226.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_off0000c7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBD 10612 bytes
SHA-256: 54e1548c76e9c7369d1ac8bd7cd2a90844624a9248af2e609b36d802a9661926
font_02_sfnt_off0000f7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DC 17804 bytes
SHA-256: 518e8035698f3c8d63b0789883c9b7dfc0f03ca50613211c1d2bd9e20cc67e62

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