Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5c63c1017178512…

MALICIOUS

PDF

80.6 KB Created: 2021-09-02 19:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 793bd0cb8e4022b33a0d3a4cc16aee7c SHA-1: 5690fde52fd580fa2f45ff5c727c793936e65f9e SHA-256: a5c63c1017178512fcc2666864855725c5e7b5b22cc5158eee37e2953d1e9cd1
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://krisoc.ru/uplcv?utm_term=protracted+conflict+pdf PDF link annotation
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/e9c92846c0ea3a11d51bdf7af98724b6/78830633206.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b7f8eaa3a---waporagokat.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/ggv7ek6musvt680ro0gr39m92f/vawuxibakesibapiz.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/dmpvfdfrrirm9ma3hl6uklgdsl/fibelapozedun.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160e556ab69fbc---94945780425.pdfIn PDF document text
    • http://bakkervoorwinde.nl/app/webroot/files/ckeditor_files/files/15617093997.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/letifavarimo.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/mezamoja.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/f6662825dbdc7c5def19efa47c7efcd9/juvetunidasagikoguv.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/91112886817.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/pozobapajuwapukatumokud.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/81287780893.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1611fce1fe4266---bewibesibuxenor.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/wujodavigebo.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/15426604325.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/1924085122.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/31d01d9d7afb970c6682dc915115c062/pixobetu.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/89854893456.pdfIn PDF document text
    • http://khanaphatgroup.com/UserFiles/file/99488345653.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/31287669428.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608d396cc3221---61554207915.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/40j44etlm76kp6rt6es4u4rc11/ludokew.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/befewu.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///daxajiduzixitemixaz.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54c6953c65---pufewomevugugalebelafuxe.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_off0000d9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DE 10444 bytes
SHA-256: f4d68b634df6a7cf7bfa137675a40a299b5781916515895185d33b242073e236
font_01_sfnt_off0000f19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19D 16848 bytes
SHA-256: 5bbda6ec0a580672fb4065e40d488c6eca175144fcca226b1139dc6f46ccd00b
font_02_sfnt_off00011ced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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