Malicious PDF — malware analysis report

Static analysis result for SHA-256 783ee8921f26c93c…

MALICIOUS

PDF

71.8 KB Created: 2021-09-03 23:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 935648ad215fed4636b8b4c819c50aca SHA-1: 58cac96992e16bcb00077d4a748cc172c286c109 SHA-256: 783ee8921f26c93c8461fff702fd17f0a741c90ed93fa80b813f1bca8345f16d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that likely lead to phishing sites or further malware. The presence of multiple links on potentially compromised WordPress uploads and disposable hosting suggests an attempt to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://pistant.ru/uplcv?utm_term=cb3+fit+sport+wireless+earbuds+user+manual PDF link annotation
    • http://www.malagatour.es/ckfinder/userfiles/files/73613451324.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/17gf0hcpl1frmb73flcvga9g4e/39369962993.pdfIn PDF document text
    • http://bosch-service-center.ru/uploads/files/97020868735.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210821105141.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f4959eb03---kubexudamowamefugod.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e81cac883---59070015933.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c22d199f6d5---zufiwiwonidawo.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/fajexegawadezizofalawesal.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/53781028827.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160d81f974f9b1---3866191783.pdfIn PDF document text
    • http://skyline64reunion.com/clients/e/ec/ec378541aa9b73e2b99de5ca5545ec21/File/37058978793.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/7236796412.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/nopetogetovupigiwa.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/5491591576.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/fusiretivunazijovakakovu.pdfIn PDF document text
    • https://avenue102.com/uploads/file/50597164241.pdfIn PDF document text
    • http://hasyo.net/files/file/juwafo.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b84b2200d---55347298997.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c550ed4b5df---3028280544.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/wodubamisiperujibamaxigu.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/virokipolefimefenetupoziz.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/xegukop.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75769239618.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_off0000b4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4EE 16648 bytes
SHA-256: c90409bb81b4d3120b4e9270bfc6ac90a0127905a6d3d9a41e8e14f360a34a57
font_01_sfnt_off0000dfb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB0 11188 bytes
SHA-256: d2053e1aede9ae983f0b62f97315535cc39d7b0852b6997b41b3e0ce0af292cb
font_02_sfnt_off0000f9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1