Malicious PDF — malware analysis report

Static analysis result for SHA-256 58f04bf30396161c…

MALICIOUS

PDF

94.5 KB Created: 2021-07-07 14:54:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 5d0f5ab7bab730510216b8482083924c SHA-1: 609eff9c87c66648fde2d31ef839959f08f3a061 SHA-256: 58f04bf30396161c1df4a9db36b5a71df68ac337b33b6e6b8d740c840304334d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or SEO poisoning attempt. The presence of external URIs and the nature of the links indicate an attempt to redirect users to malicious sites, potentially for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://antonioruizabogados.es/userfiles/file/78300426589.pdf In PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/7h09siida8iafphu2kmcm0ar69/raxuwixapazimufanepib.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/11731277942.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/qmtfc5bd5qnvs3guscrnk7do0u/23417667444.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/9faht71noadlgb84qvd0j6t9ek/41160029366.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5605464668.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/66613736365.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160780f91a1a7e---52011423204.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/67vnphj8d09q4pefvbbal44to5/12937813804.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/7efb5ad55b15911139f12f8d0309e095/podej.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/159da1a176270c68d57446b63b402789/90434593261.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/pimezeninafizowexugojuj.pdfIn PDF document text
    • http://allasclub.com/campannas/file/77264317642.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7bf38c17d---fexigeroliwiwusugima.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da765a88be---36774996617.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/b8a4fabef5ca7182cb7b175f749901a3/togitumevelexefuvinido.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d44822405a---60297453777.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/bb5da97c88f86dace7e2cee650d7af9f/34623292189.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd7ccb2447---jijedegirusimige.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c78be21d7e---93180794556.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/38292830367.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=creating+and+solving+compound+inequalitiesPDF 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_off00010d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001251d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251D 11200 bytes
SHA-256: d38c0f080adf296542fccd33877386085889308d532faa4edb13a75f0e61e7e6
font_02_sfnt_off00013ed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED6 17404 bytes
SHA-256: 79011c773f71fcf71525ce9e195c90f6ccbdb1cfcacb793bd8f9069bcb747253

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