Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d87566636a05d67…

MALICIOUS

PDF

82.3 KB Created: 2021-07-20 13:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 682516221d85e3c6a67edf7bd0b90058 SHA-1: 4e5dea63f200bfc9ab9d8ac16803c9ddb8d1e9e9 SHA-256: 9d87566636a05d67b81096893cd14dc5e660ddfed04de900a60a17f0663e096f
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, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links pointing to various websites, with several hosted on compromised WordPress installations. The presence of these links suggests an attempt to direct users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://radio-salsa.com/php/rs/filesupload/file/27396694506.pdf In PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b6572d44237---84279668759.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/vedewimovomoji.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608108ce647e9---kosakimi.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b9902b3d273---kavaboruxonuxat.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/93148463498.pdfIn PDF document text
    • https://ivanamihic.com//files/21372518283.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/40473422512.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5b2c60d5b---mogozer.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0f3a278ab---87978596105.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/581db1061c26203e89e4014e13299f6a/10590868403.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/72504e8c5af99c3acafc976a09ecf7ac/6228751178.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/nomuzuwonuv.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/9feda43d1dbe6e0f84042ec40e7a9c9a/jenadu.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22ce80c671---zaxin.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc8dd73e63---fagenikuwu.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/24367616482.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/domesibawuko.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de7f07cb5eb---43606831535.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160754475c2e5f---xotebuvexawopabemudaxiwu.pdfIn PDF document text
    • http://elitvorota.ru/f/file/75607444310.pdfIn PDF document text
    • https://wagaskar.com/media/79321820046.pdfIn PDF document text
    • http://apvn.info/userfiles/file/jojumuxibibifusoboliletox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=circle+square+footagePDF 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_off0000de38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE38 10684 bytes
SHA-256: ca90afb7d6d1c3720ab1e37c5fedb07831876df0c2f930e8b7c970f03760311d
font_01_sfnt_off0000f695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF695 17516 bytes
SHA-256: ee45b1db60a85c04783cbb220ae8eab7f8362e473848bdda16e4d98ad085e042
font_02_sfnt_off0001246d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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