Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d748217bcbe901f…

MALICIOUS

PDF

77.9 KB Created: 2021-06-29 15:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ec50c320e4f402f57f77d9fed8da7d5f SHA-1: 539e1c9de3678b8bc8eeaf3d1388c044e465850e SHA-256: 7d748217bcbe901fbbdf9f54ccdef2a1fc00f64dcae07f78682a494955af5e73
164 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. The file contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting it is designed to lure users to download a secondary payload. The presence of embedded JavaScript indicates an attempt to exploit PDF vulnerabilities for code execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://warungmimpishio.com/contents//files/kotirolixexudenapidanibu.pdf In PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9221483a0c---58289891688.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab63dd649d2---33025232132.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/57985beceab5312145242848b0036373/fewasepagexos.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609fec1db0340---96307284418.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5dd7396fb2---padawidujabakuzojusejonij.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/a199b2819ef9d45478b5ace527620403/lubewodefowajuxakevawutig.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/8e9034ae9bc860ec6eb3dbd7f28a2b6c/38662035032.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d3ecc0d6b---73754395229.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/3j1urla0u0s7hp38krvsea5v8u/sewekivetusakuv.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/ff1f5a2928c08229e9418edd9a61fb11/dirijurate.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/linajesopogitujej.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa62cb49338---19894416047.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/40192652501.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d48f0a0fc---46515469925.pdfIn PDF document text
    • http://www.irrv.org/uploads/files/ragimaliginitofa.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/bukulotijuse.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b77515091b4---kuziwekepixofumowobit.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/40991b31319c897d82e8925b0fd03b1c/jevegefisatisete.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/lvknpo3mrg0oeu2u60cidsisko/nabakibatesike.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/df216ef691c0ae217f4835d0cbacec39/vuwuriteladaripujep.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/vefodivomuvuneromad.pdfIn PDF document text
    • http://gasnguyenanhst.com/js/ckfinder/userfiles/files/21777777036.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/beboxufulubivadu.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9215499a1f---xakabuxupozisak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=brooks+title+and+escrowPDF 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_off0000ceec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEEC 10596 bytes
SHA-256: e383043d9e3217ec0ca71b5f3508b179311139892e700c05a07eede2a5cb6a29
font_01_sfnt_off0000e757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE757 16584 bytes
SHA-256: 08d0d938d2963f7d3b5b5133931326edceac87674af8a606b36ec3025747f28b
font_02_sfnt_off0001123a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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