Malicious PDF — malware analysis report

Static analysis result for SHA-256 66012c813ab054cb…

MALICIOUS

PDF

74.2 KB Created: 2021-09-03 08:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f019ffb75c9e5153b2c8833a8401ab4e SHA-1: e51a9937d2995fdab16c973fca51eb4ba5922338 SHA-256: 66012c813ab054cbbbaa0ba25a8990c0f978d01d90bcaf5fd096e9a0ed114086
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links point towards an attempt to redirect users to malicious content, likely exploiting a PDF vulnerability.

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 http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16089b808978cf---jodop.pdf In PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/0h9hfqlvva254v9rn94uk3ki3b/zotoziwotigilep.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161004ae282ebe---jifokerenoxoduw.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/96222754154.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b4813037dbc---kuzewodisizonamoto.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/pativovisujisexunanejozu.pdfIn PDF document text
    • https://avflash.nl/upload/files/temitije.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8418d38ae---jutexefepifu.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/nelemudutigajulotazil.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/xifadafefonerake.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160b03caa0fb5d---15045051411.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/fejaxokatomen.pdfIn PDF document text
    • https://adikkeempat.com/contents//files/tenisiperopilame.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/lesagisapalaxuvibegit.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612cdb504d1ee---8514034953.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8c8830d4f---7305975236.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/23534424645.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/26667468531.pdfIn PDF document text
    • http://klaaswester.nl/img/file/wulosetesesowovebige.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021082703591312.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/jivagugufolamalesetaxefi.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/7863aaabee9dfaaf5369af3bdc967d8a/xobenevix.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a11475e726e---11119925220.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/70s5d4lks4mus7r19o3c63eh6b/dubogowunusawagidebuzex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=flexitarian+diet+pdfPDF link annotation
    • 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_off0000bf3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF3F 10284 bytes
SHA-256: 07487310ca775f30af130c784bbf9685e46168c9627ca3bed012448fe1188f34
font_01_sfnt_off0000d674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD674 18488 bytes
SHA-256: 5ed97a99357a6c391696a7b1aa2cf07607209efc27d5197bea55db2bc1ddc9a2
font_02_sfnt_off00010321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10321 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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