Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed07339d1a1f6aee…

MALICIOUS

PDF

79.1 KB Created: 2021-09-12 05:43:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c41d42a5d34aa247a07b27786567b968 SHA-1: 251b490c1eab996222c198eea7457c81d0c5816c SHA-256: ed07339d1a1f6aee17c8bc42c0e66d05bad168ef58527f25ec516d92253a9991
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, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised WordPress installations. This suggests a phishing or malware distribution scheme, where users are lured to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://infinivideo.hu/sites/infinivideo/files/niwadazexotexokib.pdf In PDF document text
    • http://radis-rrl.ru/userfiles/image/mumavozugiwodor.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135504e25049---batagejivup.pdfIn PDF document text
    • http://fpole.ru/sadm_files/55332971744.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/10b242c414b59bd763c7896c040fe442/xuxaxesu.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136f166be7be---88912710430.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/rofolasukanon.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/wojuditeje.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/79780749561.pdfIn PDF document text
    • http://watch62.ru/files/files/36300669392.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/10842025897.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/96337659308.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132a4d72ff20---sapelibubibepirujo.pdfIn PDF document text
    • http://topmebli.com/content/xuploadimages/file/sutejebo.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/30926666486.pdfIn PDF document text
    • https://suruburi.net/mm/file/88172606772.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161374b205b02a---90454130267.pdfIn PDF document text
    • https://vyrukrc.lt/userfiles/file/mekirobumupewoketad.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/37c357ef9ee3b45da52a911a3a4fd0f8/42033950582.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/98dc0302eea96ebc21c4acf383c1efd4/31653259264.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/pixetegab.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/30596568446.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/6704976714.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=4u+movies+free+onlinePDF 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_off0000d46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46E 17188 bytes
SHA-256: 69307fa20f3521a70a1c4880ffa8a0bb76cbbc4216cecb1d6e6d28f8bfa6956c
font_01_sfnt_off0001005e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11875 10264 bytes
SHA-256: 2f436f079bb9fa9abc2b6d838a08a3643c801eda09a9513bd07fff31cae40fd2

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