Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d8a97dcb6e97fe2…

MALICIOUS

PDF

80.9 KB Created: 2021-08-21 12:21:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 0cf41caff46e1dfd4d14d1b7b9550a07 SHA-1: fb2539d14f127e5b3944a505ffde96d44c1db89f SHA-256: 4d8a97dcb6e97fe2b8b7c15e28e6b2a91fbfe4ae3c75e2a95eba3087309decf5
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple disposable domains and compromised CMS upload storage, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/c4f1e8773ac037d346cdf9124bab39ef/98501827750.pdf In PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/pozotezu.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4702f0f810---4036153473.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a25181d18---fodatufufatupowutagad.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/8oji8rgg9lku0aio5urvekuq51/xuwezezobifogapewubavu.pdfIn PDF document text
    • http://portableandcool.com/files/files/zowukawiforimuxex.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/f2e3fe0459dd5ae456bc76ca43f585f2/54913689212.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/8f7b39d2e25c7924646b39668a32ec73/27918644249.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/56555835086.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/ec62c86a5f3351323bbcb3765f3e2854/15859715760.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/2c1e07e5151055e4a992284e2ca44aae/17714632923.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/nesofexozinibudux.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/zudetugiloged.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9p3eohd847bcdsllo0nlejgle0/sepurazixomumijodori.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/08afd1a630560c0caab3b343e53bc2e7/2201804746.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c711f931a9---54849523366.pdfIn PDF document text
    • http://cserepakciok.hu/xdata/file/53207152981.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f0e1f3324---15654431724.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/vixedujeseguvan.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/jorovavo.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/6130554529.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210710172345.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/6707397055.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=science+project+graphic+organizerPDF 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_off0000d90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF124 10704 bytes
SHA-256: 869c60edfe00c53302e30d8bda2ec2d0d3b1c1919038ccff11c433f1b0993544
font_02_sfnt_off000109aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AA 16856 bytes
SHA-256: aba1b0a280411638701a41b6fa46e7ad306bd27ff87fc2475b5f532b55c18d60