Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8d807491bffca32…

MALICIOUS

PDF

78.0 KB Created: 2021-09-05 13:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b950c41bc4b54c2959235768add4ab6e SHA-1: 3910d5c1f087866411a6deb87305b21aec11e1c4 SHA-256: a8d807491bffca329d3bc686309c6c96761e9bc1d9bded71c60976c34c832813
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://garglob.ru/uplcv?utm_term=sequences+math+pdf PDF link annotation
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/62259451038.pdfIn PDF document text
    • https://saam.vn/images/content/file/95237893930.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/56566145377.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/39303064442.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/78286119847.pdfIn PDF document text
    • http://epplast.com/files/file/kerusodek.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/pasiwukuxokimo.pdfIn PDF document text
    • https://zzarosiscarampola.it/file/82184688661.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/davukedusuvobeginifo.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16086776e933a5---93655765157.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/ac37a382f32e9e89041f22fd74a4299f/vudizopajujigefilokedat.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161207bd275216---89047905182.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a981d0ebdcc---jafemotejawezadikinezi.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/38892255720.pdfIn PDF document text
    • http://hujiangsy.com/upload/files/feviritija.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/16462014498.pdfIn PDF document text
    • https://soechi.com/userfiles/file/newufajumup.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210701235504.pdfIn PDF document text
    • https://ikima.fr/uploads/file/89715191245.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//rasusuwot.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/faxipuxisogekonuvirufunol.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/15836785023.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210819_064210.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/43045206277.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_off0000cd59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE570 10848 bytes
SHA-256: dac0ccd40b8bc55f8a4f38dae2797045ba1420af7b66dc92cbb5efc8c32174db
font_02_sfnt_off0000fe14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE14 17344 bytes
SHA-256: cf3d7b188032c7db5e15d10189d51e975b3c4a7379c7967cb842f0562c2c6b24

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