Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e6aa80949c1c0fd…

MALICIOUS

PDF

86.5 KB Created: 2021-09-03 23:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4370edb7b068f54e6ef136ee979c41ca SHA-1: f1e5d1f4bade1cdc7e347b9f5f9fc72da6c46271 SHA-256: 7e6aa80949c1c0fdc8bd2806a978a7de96689eb63fe57cb4a7a81472d48e79b9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. This structure suggests the document is designed as a link farm to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/bbab2cec4a91bf7a6046490dcc55e2e6/39125637851.pdf In PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f59890cd6---8989875275.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/0529addc62c1a7a6925c6eebca2bfcfd/suzajisibomevogaxasewa.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4db95f1ce1af98bb4ca98a7e68c8c2bb/68005069612.pdfIn PDF document text
    • http://bbbswalkforkids.com/clients/c/cf/cf8d0549bdc9bbdffca8bc0db9808b96/File/zagujamesaxalojazumurevi.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/9b8bc906e6ee94aafadfee7a6e02a607/rawozewibabawejinit.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zetupexegozitasoto.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/zipefof.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/uvk155ukffdoqdc1ciigcij1p5/xizoma.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d693f06ef---43336619670.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/03f54691b42ec0f28bd50f8263d0c51f/77001508116.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607edd4d3854b---dofoxovikazemiruton.pdfIn PDF document text
    • https://arzhosting.com/calisma2/files/uploads/gigenigofilo.pdfIn PDF document text
    • http://agavietnam.com/img/files/vejavido.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/6f4ebeb4110625c6fc6721efaeb1f08b/42276615095.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/56282441211.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609553d74e376---jetujagizodonirokeg.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1607c70ce74477---65819724723.pdfIn PDF document text
    • https://onlinendttraining.net/files/sufixenipejitubebebuduf.pdfIn PDF document text
    • http://gurolmumcu.com/userfiles/file/7558418165.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/fefibirilukewitobatipo.pdfIn PDF document text
    • http://slsnn.ru/content/files/55786958508.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=little+mermaid+coloring+pages+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_off0000edad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BF 17724 bytes
SHA-256: 2237a3c5cec256972dbfb6b15496376c85a5ea1ffdd5775c620865b17108162b
font_02_sfnt_off00013359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13359 10920 bytes
SHA-256: f004c04b168e3634164d08666b3c62b8446345bf73122f668d454c80a05f7442

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