Malicious PDF — malware analysis report

Static analysis result for SHA-256 bea33d861a15184e…

MALICIOUS

PDF

82.4 KB Created: 2021-09-01 20:17:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c96af77d5edc2f4eaded56074cda6aa3 SHA-1: c24d349460df49cb3b6b8e11622aa1959cbec5bd SHA-256: bea33d861a15184ec0c69c436592e44f0e2016710c749f272f422307b40a85f2
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or lead them to malicious content through these links. The structure suggests a link farm designed to obscure the ultimate destination or leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16094e2d6251a9---luvimilototodido.pdf In PDF document text
    • http://bradzo-ep.com/uploads/files/vesusaw.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/peruzi.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607654d7304b5---16858462124.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df41e380061---82817116885.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/53378389834.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/16510624685.pdfIn PDF document text
    • http://sdds.be/userfiles/file/wekatigim.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6255d6961---99521161634.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/buripox.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/35951459230.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/tumulepegigekozapim.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/72695541771.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/80769779469.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/5640641198.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608563bb6399d---sesozagomefa.pdfIn PDF document text
    • https://aneri12.eu/res/file/46693579266.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce6837bb19---59482678905.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/52956262147.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/povubade.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/0ba757fc48f330c81dc9edeb2bfc1aeb/beluvodarejajub.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/62330324493.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d3ecce6d403---53736509256.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+make+windmill+modelPDF 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_off0000e31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31D 16512 bytes
SHA-256: dece2abe5edd6426eda8d891def65a00ee978d57d6debc2673e727d67307b8f2
font_01_sfnt_off00010d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D81 10312 bytes
SHA-256: b8bd54406351a2050310b2a4f99706892126afb2908bf34496368e4b948c1e34
font_02_sfnt_off000124ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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