Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fb6c4e3fe33e7a3…

MALICIOUS

PDF

92.1 KB Created: 2021-09-12 12:35:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: f87b6a95cdc101726b623c74615cf71f SHA-1: 4f581f4f1209bea2ddeeecab51df600cc297fcba SHA-256: 7fb6c4e3fe33e7a312eb3da5933f787d1f5643efc67f68ad6c69f8bf719e3b9d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, characteristic of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure and embedded URLs suggest the primary function is to redirect users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/65162476074.pdf In PDF document text
    • http://biancoacolori.it/userfiles/files/fufumefavopabiginuwuro.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/43711906169.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/85378295323.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/69055955386.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/mugademezijovuzike.pdfIn PDF document text
    • http://adbrf.com/files/fckeditor/file/1591583090613372d562ae2.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/36913669538.pdfIn PDF document text
    • http://brenderup.ro/mm/file/semezolefikunamojoxutelof.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a159abb9f6---63825310004.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/sekinezajagofawowize.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/f314668c3d05775496ce90ec6d14deea/detubobunurajezazuxigadu.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/guvodozezatasobu.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/12066317250.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/segodemunelekaz.pdfIn PDF document text
    • https://venus-forever.com/image/files/22037411932.pdfIn PDF document text
    • http://simsoncantho.com/userfiles/file/boxufifuxuwukiluk.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/bewifewixojufebaxodalenox.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/48349671901.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/wukekewuxefarinusunu.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/3427236337.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/24278184947.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/2156010512.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161331cec6e4b4---kabuwabujafinekofokodir.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132707e7fceb---98904307965.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=vidmate+2021+full+hdPDF 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_off000104f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D06 17744 bytes
SHA-256: 218e8ee78a62b0d7aeb31dc035464b05bf008abd628ad6ed8fc63110c4b5f1cb
font_02_sfnt_off00014abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ABC 10492 bytes
SHA-256: 5df26592bf3af184f831e5e0b15954c7f77b26174cfed571a096686510c7caac

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