Malicious PDF — malware analysis report

Static analysis result for SHA-256 d690afd950f2d1c7…

MALICIOUS

PDF

79.6 KB Created: 2021-09-12 09:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3e4a230371518de1225ff15cae05793a SHA-1: 593003a35ddfd4093f24fa795e0afd488dd18984 SHA-256: d690afd950f2d1c7fda18bb1de027f9ec3d30ed44a3345a5cf71130a5abdff5c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs, many hosted on compromised CMS platforms or disposable domains, designed to redirect users to malicious content. The presence of embedded URLs and the overall structure suggest an attempt to trick users into visiting these sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://huntic.ru/uplcv?utm_term=watch+13+hours+online+free+123 PDF link annotation
    • https://1877painters.com/FCKeditor/file/sexipolafoxobelebageki.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/5a6258d4b375b792fd9264f2f5944b18/poxidopaz.pdfIn PDF document text
    • https://fishboat.hr/files/76441054810.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/25458900278.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/4d40f21d77726172c2bc23003086e91e/40571533427.pdfIn PDF document text
    • http://philboyd.com/resemig.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/63322874487.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/97113298649.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/narugepilib.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/80184900221.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/84292906234.pdfIn PDF document text
    • https://rosycaffe.com/file/lumalimuwemijudogeninupel.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/nevarosenabomasonalamo.pdfIn PDF document text
    • http://lulanjina.net/upload/files/zetorudajimumubogotuvokid.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5c6edebcc---43009468839.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328264052d3---13813048062.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/76461144405.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/6780345071.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/44621381340.pdfIn PDF document text
    • https://teamcode.net/upload/files/50032061403.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/80319543191.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/pisonujigusej.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/24885371413.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/xikanomiboluzuxalamaf.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_off0000d157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD157 17952 bytes
SHA-256: 2f75592bf259cf2cc9d4f70e884f1a9e2b75031402c78657b29c226f35fcb0df
font_01_sfnt_off0000ffdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F4 10868 bytes
SHA-256: 124ac86268d85d7eab1089732b8e8c6efc861df6f6dd08de8033962082e2a331

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