Malicious PDF — malware analysis report

Static analysis result for SHA-256 6573910dca2aa105…

MALICIOUS

PDF

74.6 KB Created: 2021-09-20 02:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f490a374195636350a9a5b4a38b1b82d SHA-1: bb3324e436288ad03f1a9dae06e448c449ad38b7 SHA-256: 6573910dca2aa1059816904fa0bca191b07add3db4b92bded4f5af6d9c2c0de9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm pointing to compromised WordPress uploads and disposable hosting. The embedded URLs, such as http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d9763e68d---76840898141.pdf, are likely used to distribute further malicious content or phish for credentials. No scripts were extracted, but the PDF structure itself is designed to redirect users to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://hongming-eco.com/userfiles/file/58541692578.pdf In PDF document text
    • https://combrooncom.com/contents/files/lejudoxasexexoded.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613e43dfa479d---68910084077.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/47025404366.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/82437125239.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109190554151883.pdfIn PDF document text
    • http://grupophi.es/uploads/files/sulasewag.pdfIn PDF document text
    • https://langumeistras.lt/i/File/nidijuwolebovulifututav.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/feluwepavuxafokufam.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210912200410468.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613626566401f---94493986563.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16134533383ff3---35713922366.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/zesevu.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec2b607317---vufupefekixixopuru.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/suromimejutonos.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/69399221197.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d9763e68d---76840898141.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210920063803.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/11490293256.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/58685000363.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/12701980680.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/wuluzonuzike.pdfIn PDF document text
    • https://slide-bearing.com/d/files/vodifusanexuja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=the+rate+of+change+of+an+object%27s+positionPDF 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_off0000bd0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51E 17692 bytes
SHA-256: 7cabfc0f01960125dde5d0b8af53638701897a6597427c8ef2bdf611fbcb9f40
font_02_sfnt_off000102e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E9 10980 bytes
SHA-256: 2c15e76f5765923b541ab168b7a1f9e6f2a5469870e0aab1a6dc7089305afcfe

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