Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a4defa61a3cd7a4…

MALICIOUS

PDF

70.6 KB Created: 2021-07-04 02:01:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 52dc62fd018f1d7b2dd74e216b294ce1 SHA-1: d8ae0b08fe0bd9f0810c3421086e5f0dbd5d2e8a SHA-256: 9a4defa61a3cd7a4a9b2a600b61bd45c4b8d5db81b9c20706b40897327d227be
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure and link farm nature are consistent with techniques used to lure users to malicious sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/6b961e252046f121525997c9d7b858b1/74026475097.pdf In PDF document text
    • https://kuraniterbiye.com/resimler/files/11038892879.pdfIn PDF document text
    • https://zhansq.cn/upload/file/91236797164.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b36b4d7a0---17483053326.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/bd09f7e42f39fc6e48a39cdca15c1143/waxujo.pdfIn PDF document text
    • http://carszana.com/image/upload/File/jigobatubadadinapupote.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///domulipiguwisiporinalune.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607d66e3b88ef---89650262558.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/7pl4tf5701jcelrl57cc6esit6/11427401482.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/43648411115.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/73613048719.pdfIn PDF document text
    • http://fullx.net/files/xufunokiwijuvujufa.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854163f0f8b---bimuki.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/33690190234.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/459396098.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/822c182e6820adf1900e5f3bedd04d67/wukafajexaz.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/a9b8gtckfukq68n1kbe08hke87/97241142278.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/bddc22b06642f1d4dc4f306a2c4fc236/wonawi.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b1677959800---xenukegivupakesa.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/dfc788e0070fafac25b2eb0572d1ea6f/12826045516.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073a120e7f5f---fazadax.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/97595007791.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/87077732843.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/nigaxejixubava.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/lizoresasepewesogafe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=recon+expert+for+freePDF 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_off0000b5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F4 15568 bytes
SHA-256: 023dac721012823d0bbac83433b18e9f6a821b18e3234147f7cbfd2f6c922afe
font_01_sfnt_off0000de38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64F 10152 bytes
SHA-256: 4c5fb39ca24e5eae423f1aef3cfe04700c653f9b1c2885567eae68d3197ba7b1

Open this report in the interactive analyzer, or submit your own file for analysis.