Malicious PDF — malware analysis report

Static analysis result for SHA-256 d975f21ae15a8857…

MALICIOUS

PDF

95.6 KB Created: 2021-07-02 05:33:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: c6b749cd3354b4809f850276f9fbf68d SHA-1: c0aae0b8358a94f99f37a073fe1831d115b4760f SHA-256: d975f21ae15a88570ab14b187a5904298b729e1e958ffb3de61da4f36623c8c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many hosted on compromised CMS upload storage or disposable domains, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document is designed to farm traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://oniceh.ru/uplcv?utm_term=urban+planning+lecture+notes+pdf PDF link annotation
    • https://aviseco.ro/userfiles/file/jonedafisireruzalaja.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8df719362---sipetixesanenonerijug.pdfIn PDF document text
    • https://clubsportedinburgh.org/userfiles/files/68653965882.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/86357231807.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16081ff57349e6---3503260992.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/venepewodis.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071307ae82ef---54653655346.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/vubonuvomososebuwex.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/56648277003.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1608316eb9c07b---89215456902.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/8sioovd9tet1c2lqq9l8m21b9o/39484314574.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/bf75e2ebffc0c4ae559655b7a2a74fc6/50415292466.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/mupolodatulojamibopupebal.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/zudokowewukegiva.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921532d4cbf---29776324797.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/81427624622.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/un1hesntrs3bspio9fja2tvki1/bewafewepefomalovi.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/38707553805.pdfIn PDF document text
    • https://vestol.bg/files/file/liboxunamiwaxe.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609efcee72218---51473734342.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfb9a99993---84468969665.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0cd776838---xagofa.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/koxurifekozixewigetini.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/53626130076.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_off0001104b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001285d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285D 18452 bytes
SHA-256: 9e2846e3cc4aa7bd9787aa4a819fc358ee8a92b4bcfc12f680f990028b749064
font_02_sfnt_off000157c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157C3 11040 bytes
SHA-256: 4ada925bd7b6507ea833db21f19db9dde29aca0a72a4e01bc6f9036f32f65cd0

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