Malicious PDF — malware analysis report

Static analysis result for SHA-256 38e00d84fd5062bb…

MALICIOUS

PDF

77.9 KB Created: 2021-10-08 02:18:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 48d25db96aed3ef200b8d1b71449a35a SHA-1: 2f58ca9aaa23914578ddbb798450188ed92b7808 SHA-256: 38e00d84fd5062bb3b68b57c1e9ed0c494be88b6de1eff6758f559e7aa9c57d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a spearphishing attachment used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://nomylo.ru/uplcv?utm_term=lyrics+of+true+colors+by+justin+timberlake PDF link annotation
    • https://samoinstitute.mn/uploads/assets/file/jabifaguneponid.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/64414438446.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f21a96e218---75278902449.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131821caf00f---takanug.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/90474507840.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/49718671964.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/gosapifa.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/vudapibinilavakilamob.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/53170111215.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/52627302276.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/210902150529704707k5t8c.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/45855108621.pdfIn PDF document text
    • http://zerosquareonline.com/file/22232003644.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/64145148853.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/70636090950.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a6704deca---94485396937.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16155955b7d4ff---vedubig.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d35a40ac4b---43906219823.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/wuworelasawava.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/jinasipebowenanuzub.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613342762126b---zujudonidubituxozeve.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/bfd46cb4d1b3a2ad364af13233128d2f/jonatage.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/58746581626.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/waxoripovodo.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/danoxix.pdfIn PDF document text
    • https://plasy.com/uploads/file/17082998931.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614f38be672ac---xitagezivobalidafawira.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/b270bdb68fae135d5416d91dd42c69c2/xuwakuxujakivawojaxewar.pdfIn PDF document text
    • 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_off0000c6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D6 18276 bytes
SHA-256: 2cd1e8c539e4168218cd8d960770d7e4ae25ebb87c345bd2f1e2f5d931030ab9
font_01_sfnt_off0000f65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E76 11032 bytes
SHA-256: 68e1b4d10986761014e9e78c4648c07f1e5c335aaba7736676221fda10c344af

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