Malicious PDF — malware analysis report

Static analysis result for SHA-256 b78db58e3933bf13…

MALICIOUS

PDF

79.6 KB Created: 2021-08-29 05:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 77ee8f473c790383aeb8fe5338e65127 SHA-1: 9de17013ca814f8ed4af87e55e18b9d427781cc7 SHA-256: b78db58e3933bf134804f38f2f3b97fe2d9a836d6391a2185327d461bd5e90e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a PDF-based phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://synerhu.ru/uplcv?utm_term=confluence+external+users PDF link annotation
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16093085aca0b9---7036233903.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160e50c6a5d053---99969689746.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/4a905caecc8e40e1911221aa5003a669/xatulivojedubutotesegez.pdfIn PDF document text
    • http://firegallery.ru/img/upload/85005116635.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/salilutatidugolavaditaxe.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b798ec74246---mudeg.pdfIn PDF document text
    • http://christopherdallo.com/file/62212692957.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7d1d52fef---dopap.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f17811a333---matisirozapete.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/gupovizukasemugo.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16091e8dd3dd30---godusejezusi.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/26805960113.pdfIn PDF document text
    • http://remont-m.com/userfiles/file/valagaxoxejumubele.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f291ca0816---dojijotosukiwegaj.pdfIn PDF document text
    • http://cx-gl.hu/images/files/wozomutifejekegizipijenub.pdfIn PDF document text
    • https://polistirendecor.ro/app/webroot/files/userfiles/files/sewazokeboj.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/27590865043.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/tunuzeteduxuwuvosi.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/9221508917.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad96ae11117---97555221795.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/42657811597.pdfIn PDF document text
    • http://nbpcpentecostalchurch.com/clients/65183/File/nejusuwupexuposova.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a1ccd4710---54608360372.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160a85d27bdce7---6073973186.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_off0000d2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE1 10468 bytes
SHA-256: f4cc062a0f6af2b517ce6ed876b74bfa7e9ba6997166c7beb6b367f6c899a9f6
font_02_sfnt_off000102ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EA 17696 bytes
SHA-256: cb7cce6223fa9f6e3e713e12b4a5c51d65d764361f8793058dee4722092d91f2