Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8e7d6ef3bf1b787…

MALICIOUS

PDF

95.3 KB Created: 2021-06-29 21:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e851d3ab564eed1ced0894b56f8bcaf3 SHA-1: 0c072a25601bab41e6d1e82bdb14f21c4ee9d55f SHA-256: f8e7d6ef3bf1b78740d8da4a6b7b36234115c1eba36de1108a80a3a511e24e83
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure victims. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable due to encoding issues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://kovtec.pl/eurostyl/photos/file/1227838969.pdf In PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/b1842d039287bcc52952e2e4f1ef2bd0/nowokikunuwugamozaputego.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/bibipugususa.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/27210271191.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/xegiresavoponumewizezos.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb37e28214---15149672093.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/70386024545.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/juzid.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/lomipoxalef.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/k5m0hk7jnahkub2sk1jglmniq6/dakebuguremulijewofol.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcda8e550d---lojoxa.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/ueiu8iuvhltr4jhu6fpv59hbsb/jegijuxel.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/4186204437.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/fedavuzeleruzutijezaxuti.pdfIn PDF document text
    • https://businesslife.com/content/file/kinefotujupanikofudew.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef60c7595f---tafizumizakinozo.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/4100dd34396fe5d3eb330d5eb9d98f41/44410554678.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/33602949183.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/a3e8ef9026aa9fcbb3035db06ee878ca/27153871421.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817de2c1b8f---mopeputuvonoza.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607168384bb12---87027547418.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/ce9d983bdbeb6eaeae3f65f27200aaa7/64470438256.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=wow+max+pet+levelPDF 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_off000114b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B9 10196 bytes
SHA-256: e096164931a296d6e4ec87cc6287c5e861c06821aea6ef991028a3f07c138b95
font_01_sfnt_off00012ba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA6 17092 bytes
SHA-256: a54c05799597c95e15c40cdd97fc2b96683e89b57c1873d64ae45623de1f6a61
font_02_sfnt_off0001586f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1586F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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