Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd34345efc9355e7…

MALICIOUS

PDF

90.7 KB Created: 2021-06-25 21:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d0406372619d2ecde0baa8e8ff4948c2 SHA-1: e441823b025d9a2767c2a4dde93b8bb7cd8b03c5 SHA-256: cd34345efc9355e71c780b2156070916c0a8af9868c29c9b840fcff202155b0c
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution attempt. The embedded URLs are likely used to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/3rhmhchrqkldf5ge3rsjj78abn/tupigofewovop.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/3346091575.pdf
    • http://amuseonline.com/absite/userfiles/file/vukomuzawowifarumitononom.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbd20b4feb---bezasopifim.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b0f8989e614c88fc52152c0880231c40/53619935438.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/28ai6qudn35lrm956sbccb69o2/xatigipuxadijex.pdf
    • http://alliusie.com/userfiles/file/peluxokamekebavatetepe.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091e73b73893---vumesafozutakogugolag.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/50b1bc18b47516357392e548ae79cca3/44884143688.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16071fd50707b8---78505058852.pdf
    • http://escqatar.com/uploads/userfiles/file/file/sumevotagesa.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f8ea45919---lozepojusizigipolimoxejir.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/smgjpmrg8fsdde420l1n3l5npg/wizarisuwovonevedu.pdf
    • http://abwmountvernon.com/uploads/files/4802359544.pdf
    • https://schmitz.cz/res/file/sazaguxumid.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/d45f42b5596bc20243b4d28230cbabb5/99538424219.pdf
    • http://alliusie.com/userfiles/file/27023868895.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/b9e55416327c43e4af74263d8bd6523e/55156038388.pdf
    • https://cvsc.co/userfiles/file/rijuvogalagi.pdf
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/gutarekikug.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6adfbfb4c---puwiti.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608700262fc68---disijab.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fac34bd3f---jadifimuxet.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089cc8063d98---zigozosov.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=master+and+commander+the+far+side
    • 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_off0000fe9f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9F 16792 bytes
font_01_sfnt_off000116b6.bin
bca172f4a5fc35c50d1047c5dd6f212c7c3b6186a737bd8301f8567df04a11ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116B6 10688 bytes
font_02_sfnt_off00012f04.bin
c3ee62e9fcca1b5056f3a301e99b3981eb0ab98c60be5f13e86469c824c1665a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F04 17276 bytes

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