Malicious PDF — malware analysis report

Static analysis result for SHA-256 5414358b7fbb58d3…

MALICIOUS

PDF

79.3 KB Created: 2021-07-22 11:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dabd48e5276002bbf2d425fab654ee19 SHA-1: 35b34b23bb9d20854b6f614fca6cb0f6299038c2 SHA-256: 5414358b7fbb58d3e3f209abeb02df99032474365b9fe0dd0248e1f98252f8e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm designed to direct users to numerous websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, limiting the analysis to the embedded URLs and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/c04kboqr4tsnpscvf7gg51usfv/laloxesivibak.pdf In PDF document text
    • http://allasclub.com/campannas/file/rewapemoxo.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/978935801.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/8d15bd97eff4d519a057de6dae83eab5/6986771020.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/rofodarekesezibobifasef.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/gdqi7epnulq5pc4a9ckd5tioka/9621227322.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/monebawisajujanuj.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/vonitif.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16fbce4870---46904122169.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021071811134073499.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/1374tlruahj8d7799ktqb1jj9u/69935641495.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/tnq1oqf5qng56lbspek8kj2mv3/winuzamugixizoxanulimevew.pdfIn PDF document text
    • https://jetaime-shop.com/files/nubolonagutaxisokexapox.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/tujagowenunuvorevi.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16088f101a5e0f---66372697325.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/57436723988.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/dosar.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/27989435940.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/jatapogijulowo.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607a338d1e53b---revudemurovuriwozulalaw.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/fagokedodamivebifimuxob.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/38426613258.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/fuveburenedo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=online+dictionary+korean+to+englishPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC795 10880 bytes
SHA-256: c2589d1f73cf983e2e513c895e7f5d695d8dd7194e8d94b4c356fbe9e4456fb9
font_01_sfnt_off0000e07d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07D 1920 bytes
SHA-256: 4ebe22109b1bc7269f72741336139b255b6747a4d5ad710d95273605d519158e
font_02_sfnt_off0000e964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE964 16908 bytes
SHA-256: 7811939df5857bcb9f0dab938422cce81e31741d33003ad34c398200f62a8970
font_03_sfnt_off00011583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11583 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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