Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd171d60b9ea3803…

MALICIOUS

PDF

87.1 KB Created: 2021-07-21 03:30:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 36f9f3a060eb82c1e205932d92715aef SHA-1: 154357f2fed993d3a19661ba38a1112c455a6b40 SHA-256: bd171d60b9ea3803e8a502669c7cbc6134514d1646cb8752f738c3811e926c3f
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, indicating it functions as a link farm. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d00828f636---dalewusojadunafulape.pdf In PDF document text
    • https://carlojans.com/cms/file/40270219197.pdfIn PDF document text
    • http://fairview58.org/clients/b/b5/b5cf5456a34e3fefef15e35162a7177a/File/sukilepodupefijixupo.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/31965965146.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c17b37edb59---56181259306.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/kikeneninuk.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/pmn91k7miekk8n97tkfdbqjrhh/luzitufoxekusolukin.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085628217f11---bifufofuber.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b060205af48---zovasug.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/xogunegeken.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/79973970573.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/27139990799.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c631d193495---detanobom.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/9b73e14d9d2db8f0ba575dbd9a7cb52d/xujurek.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/051001477214.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/vazatibowi.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc341531415---pudenavavikam.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/60b2476132fea49dbb31561a39b6aec1/60299687232.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/kaxorit.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/sabefovomem.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/ba56d8fe87ba344cd745f424311e69b5/nejimolola.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/ismrrhj24j75js9eo6ru0gvha1/niwufepenoza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=tim+tuttle+and+erica+rico+marriedPDF link annotation
    • 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_off0000f139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF139 10424 bytes
SHA-256: 18babb043ff62257a516e39271a2cbb4a1ab3c40bfd5ad013292be55204357d9
font_01_sfnt_off000108c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C5 17560 bytes
SHA-256: 7002643c12640c7a362b80b1994430cf04ceebd53b50c7cc74a25644d5a19ac3
font_02_sfnt_off0001370a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1370A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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